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NullPointerException on MrNom

I was trying to execute Mr Nom(from the book Begining Android Games by Mario Zechner). but it doesn't work. My first atemp was create 2 different projects, one called framework where are com.badlogic.androidgames.framework and com.badlogic.androidgames.framework files and other project called mrnom (com.badlogic.androidgames.mrnom)with the rest of files. the framework project was added mrnom project/java build path/project/add and the result was this:
logcat
11-07 15:21:55.573: W/dalvikvm(641): Unable to resolve superclass of Lcom/badlogic/androidgames/mrnom/MrNom; (445)
11-07 15:21:55.573: W/dalvikvm(641): Link of class 'Lcom/badlogic/androidgames/mrnom/MrNom;' failed
11-07 15:21:55.573: D/AndroidRuntime(641): Shutting down VM
11-07 15:21:55.573: W/dalvikvm(641): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
11-07 15:21:55.583: E/AndroidRuntime(641): FATAL EXCEPTION: main
11-07 15:21:55.583: E/AndroidRuntime(641): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.badlogic.androidgames.mrnom/com.badlogic.androidgames.mrnom.MrNom}: java.lang.ClassNotFoundException: com.badlogic.androidgames.mrnom.MrNom
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread.access$600(ActivityThread.java:130)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.os.Handler.dispatchMessage(Handler.java:99)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.os.Looper.loop(Looper.java:137)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-07 15:21:55.583: E/AndroidRuntime(641): at java.lang.reflect.Method.invokeNative(Native Method)
11-07 15:21:55.583: E/AndroidRuntime(641): at java.lang.reflect.Method.invoke(Method.java:511)
11-07 15:21:55.583: E/AndroidRuntime(641): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-07 15:21:55.583: E/AndroidRuntime(641): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-07 15:21:55.583: E/AndroidRuntime(641): at dalvik.system.NativeStart.main(Native Method)
11-07 15:21:55.583: E/AndroidRuntime(641): Caused by: java.lang.ClassNotFoundException: com.badlogic.androidgames.mrnom.MrNom
11-07 15:21:55.583: E/AndroidRuntime(641): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
11-07 15:21:55.583: E/AndroidRuntime(641): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
11-07 15:21:55.583: E/AndroidRuntime(641): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
11-07 15:21:55.583: E/AndroidRuntime(641): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
11-07 15:21:55.583: E/AndroidRuntime(641): ... 11 more
11-07 15:24:06.602: E/Trace(662): error opening trace file: No such file or directory (2)
11-07 15:24:06.902: W/dalvikvm(662): Unable to resolve superclass of Lcom/badlogic/androidgames/mrnom/MrNom; (445)
11-07 15:24:06.902: W/dalvikvm(662): Link of class 'Lcom/badlogic/androidgames/mrnom/MrNom;' failed
11-07 15:24:06.902: D/AndroidRuntime(662): Shutting down VM
11-07 15:24:06.932: W/dalvikvm(662): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
11-07 15:24:06.952: E/AndroidRuntime(662): FATAL EXCEPTION: main
11-07 15:24:06.952: E/AndroidRuntime(662): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.badlogic.androidgames.mrnom/com.badlogic.androidgames.mrnom.MrNom}: java.lang.ClassNotFoundException: com.badlogic.androidgames.mrnom.MrNom
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread.access$600(ActivityThread.java:130)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.os.Handler.dispatchMessage(Handler.java:99)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.os.Looper.loop(Looper.java:137)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-07 15:24:06.952: E/AndroidRuntime(662): at java.lang.reflect.Method.invokeNative(Native Method)
11-07 15:24:06.952: E/AndroidRuntime(662): at java.lang.reflect.Method.invoke(Method.java:511)
11-07 15:24:06.952: E/AndroidRuntime(662): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-07 15:24:06.952: E/AndroidRuntime(662): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-07 15:24:06.952: E/AndroidRuntime(662): at dalvik.system.NativeStart.main(Native Method)
11-07 15:24:06.952: E/AndroidRuntime(662): Caused by: java.lang.ClassNotFoundException: com.badlogic.androidgames.mrnom.MrNom
11-07 15:24:06.952: E/AndroidRuntime(662): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
11-07 15:24:06.952: E/AndroidRuntime(662): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
11-07 15:24:06.952: E/AndroidRuntime(662): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
11-07 15:24:06.952: E/AndroidRuntime(662): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
11-07 15:24:06.952: E/AndroidRuntime(662): ... 11 more
later I removed the framework from mrnom and added it using a jar file, the result was the same
Now, I copy the com.badlogic.androidgames.framework and com.badlogic.androidgames.framework files into mr project then I have com.badlogic.androidgames.mrnom, com.badlogic.androidgames.framework and com.badlogic.androidgames.framework in the same project but now the error is
logcat
12-05 15:42:43.510: D/dalvikvm(582): GC_EXTERNAL_ALLOC freed 57K, 53% free 2569K/5379K, external 1925K/2137K, paused 239ms
12-05 15:42:43.860: D/dalvikvm(582): GC_EXTERNAL_ALLOC freed 3K, 53% free 2569K/5379K, external 2515K/2701K, paused 36ms
12-05 15:42:44.100: W/dalvikvm(582): threadid=11: thread exiting with uncaught exception (group=0x40015560)
12-05 15:42:44.100: E/AndroidRuntime(582): FATAL EXCEPTION: Thread-12
12-05 15:42:44.100: E/AndroidRuntime(582): java.lang.NullPointerException
12-05 15:42:44.100: E/AndroidRuntime(582): at com.badlogic.androidgames.mrnom.Settings.load(Settings.java:18)
12-05 15:42:44.100: E/AndroidRuntime(582): at com.badlogic.androidgames.mrnom.LoadingScreen.update(LoadingScreen.java:41)
12-05 15:42:44.100: E/AndroidRuntime(582): at com.badlogic.androidgames.framework.impl.AndroidFastRenderView.run(AndroidFastRenderView.java:36)
12-05 15:42:44.100: E/AndroidRuntime(582): at java.lang.Thread.run(Thread.java:1019)
Settings
package com.badlogic.androidgames.mrnom;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import com.balogic.androidgames.framework.FileIO;
public class Settings {
public static boolean soundEnable=true;
public static int[] highscores=new int[]{100,80,50,30,10};
public static void load(FileIO files){
BufferedReader in=null;
try{
in=new BufferedReader(new InputStreamReader(files.readFile(".mrnom")));// line 18 error here
soundEnable=Boolean.parseBoolean(in.readLine());
for(int i=0; i<5;i++){
highscores[i]=Integer.parseInt(in.readLine());
}
}catch(IOException e){
// :( vale,trabajamos con valores predeterminados
}catch(NumberFormatException e){
// :/ vale, estos valores nos han salvado el día
}finally{
try{
if(in!=null)
in.close();
}catch(IOException e){
//nada
}
}
}
public static void save(FileIO files){
BufferedWriter out=null;
try{
out=new BufferedWriter(new OutputStreamWriter(files.writeFile(".mrnom")));
out.write(Boolean.toString(soundEnable));
for(int i=0; i<5; i++){
out.write(Integer.toString(highscores[i]));
}
}catch(IOException e){
//nada
}finally{
try{
if(out!=null)
out.close();
}catch(IOException e){
//nada
}
}
}
public static void addScore(int score){
for(int i=0;i<5;i++){
if(highscores[i]<score){
for(int j=4;j>i;j--)
highscores[j]=highscores[j-1];
highscores[i]=score;
break;
}
}
}
}
Loadingsceen
package com.badlogic.androidgames.mrnom;
import com.badlogic.androidgames.framework.Game;
import com.badlogic.androidgames.framework.Graphics;
import com.badlogic.androidgames.framework.Graphics.PixmapFormat;
import com.badlogic.androidgames.framework.Screen;
public class LoadingScreen extends Screen{
public LoadingScreen(Game game){
super(game);
}
#Override
public void update(float deltaTime){
Graphics g=game.getGraphics();
Assets.background = g.newPixmap("background.png", PixmapFormat.RGB565);
Assets.logo = g.newPixmap("logo.png", PixmapFormat.ARGB4444);
Assets.mainMenu = g.newPixmap("mainmenu.png", PixmapFormat.ARGB4444);
Assets.buttons = g.newPixmap("buttons.png", PixmapFormat.ARGB4444);
Assets.help1 = g.newPixmap("help1.png", PixmapFormat.ARGB4444);
Assets.help2 = g.newPixmap("help2.png", PixmapFormat.ARGB4444);
Assets.help3 = g.newPixmap("help3.png", PixmapFormat.ARGB4444);
Assets.numbers = g.newPixmap("numbers.png", PixmapFormat.ARGB4444);
Assets.ready = g.newPixmap("ready.png", PixmapFormat.ARGB4444);
Assets.pause = g.newPixmap("pausemenu.png", PixmapFormat.ARGB4444);
Assets.gameOver = g.newPixmap("gameover.png", PixmapFormat.ARGB4444);
Assets.headUp = g.newPixmap("headup.png", PixmapFormat.ARGB4444);
Assets.headLeft = g.newPixmap("headleft.png", PixmapFormat.ARGB4444);
Assets.headDown = g.newPixmap("headdown.png", PixmapFormat.ARGB4444);
Assets.headRight = g.newPixmap("headright.png", PixmapFormat.ARGB4444);
Assets.tail = g.newPixmap("tail.png", PixmapFormat.ARGB4444);
Assets.stain1 = g.newPixmap("stain.png", PixmapFormat.ARGB4444);
Assets.stain2 = g.newPixmap("stain2.png", PixmapFormat.ARGB4444);
Assets.stain3 = g.newPixmap("stain3.png", PixmapFormat.ARGB4444);
Assets.click = game.getAudio().newSound("click.ogg");
Assets.eat = game.getAudio().newSound("eat.ogg");
Assets.bitten = game.getAudio().newSound("bitten.ogg");
Settings.load(game.getFileIO()); //line 41 error here
game.setScreen(new MainMenuScreen(game));
}
#Override
public void present(float deltaTime) {
// TODO Auto-generated method stub
}
#Override
public void pause() {
// TODO Auto-generated method stub
}
#Override
public void resume() {
// TODO Auto-generated method stub
}
#Override
public void dispose() {
// TODO Auto-generated method stub
}
}
AndroidFastRenderView
package com.badlogic.androidgames.framework.impl;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class AndroidFastRenderView extends SurfaceView implements Runnable{
AndroidGame game;
Bitmap framebuffer;
Thread renderThread=null;
SurfaceHolder holder;
volatile boolean running=false;
public AndroidFastRenderView(AndroidGame game,Bitmap framebuffer){
super(game);
this.game=game;
this.framebuffer=framebuffer;
this.holder=getHolder();
}
public void resume(){
running=true;
renderThread=new Thread(this);
renderThread.start();
}
public void run(){
Rect dstRect=new Rect();
long startTime=System.nanoTime();
while(running){
if(!holder.getSurface().isValid())
continue;
float deltaTime=(System.nanoTime()-startTime)/1000000000.0f;
startTime=System.nanoTime();
game.getCurrentScreen().update(deltaTime);//line 36 error here
game.getCurrentScreen().present(deltaTime);
Canvas canvas=holder.lockCanvas();
canvas.getClipBounds(dstRect);
canvas.drawBitmap(framebuffer, null, dstRect,null);
holder.unlockCanvasAndPost(canvas);
}
}
public void pause(){
running=false;
while(true){
try{
renderThread.join();
break;
}catch(InterruptedException e){
//vuelve a intentarlo
}
}
}
}
Eclipse doesn't showme any mistake on code but on the emulator just say "Sorry! the application mrnom (process com.badlogic.androidgames.mrnom) has stopped unexpectedly. Please try again"
Can you help me with this? No idea what's happening :( Thank you so much.

Android: Uncaught exception causing fatal exception in main

Hi I am writing a simple app that interacts with androids camera API directly, I'm using this tutorial http://www.tutorialspoint.com/android/android_camera.htm
Could anyone show me where I am going wrong?
The log output:
01-09 23:42:56.901: D/ATRecorder(886): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader#40528bb8
01-09 23:42:57.161: D/AndroidRuntime(886): Shutting down VM
01-09 23:42:57.161: W/dalvikvm(886): threadid=1: thread exiting with uncaught exception (group=0x400205a0)
01-09 23:42:57.171: E/AndroidRuntime(886): FATAL EXCEPTION: main
01-09 23:42:57.171: E/AndroidRuntime(886): java.lang.RuntimeException: startPreview failed
01-09 23:42:57.171: E/AndroidRuntime(886): at android.hardware.Camera.startPreview(Native Method)
01-09 23:42:57.171: E/AndroidRuntime(886): at com.example.camera1.ShowCamera.surfaceCreated(ShowCamera.java:30)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.SurfaceView.updateWindow(SurfaceView.java:551)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.SurfaceView.dispatchDraw(SurfaceView.java:348)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.View.draw(View.java:6973)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.widget.FrameLayout.draw(FrameLayout.java:357)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1732)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.drawChild(ViewGroup.java:1730)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1459)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.View.draw(View.java:6973)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.widget.FrameLayout.draw(FrameLayout.java:357)
01-09 23:42:57.171: E/AndroidRuntime(886): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1997)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewRoot.draw(ViewRoot.java:1600)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewRoot.performTraversals(ViewRoot.java:1321)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.os.Handler.dispatchMessage(Handler.java:99)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.os.Looper.loop(Looper.java:150)
01-09 23:42:57.171: E/AndroidRuntime(886): at android.app.ActivityThread.main(ActivityThread.java:4277)
01-09 23:42:57.171: E/AndroidRuntime(886): at java.lang.reflect.Method.invokeNative(Native Method)
01-09 23:42:57.171: E/AndroidRuntime(886): at java.lang.reflect.Method.invoke(Method.java:507)
01-09 23:42:57.171: E/AndroidRuntime(886): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-09 23:42:57.171: E/AndroidRuntime(886): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-09 23:42:57.171: E/AndroidRuntime(886): at dalvik.system.NativeStart.main(Native Method)
I've followed it perfectly but I still get and uncaught exception in log-cat when I try to run it, here is the code in MainActivity:
package com.example.camera1;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
private Camera cameraObject;
private ShowCamera showCamera;
private ImageView pic;
public static Camera isCameraAvailiable(){
Camera object = null;
try {
object = Camera.open();
}
catch (Exception e){
}
return object;
}
private PictureCallback capturedIt = new PictureCallback() {
#Override
public void onPictureTaken(byte[] data, Camera camera) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data , 0, data .length);
if(bitmap==null){
Toast.makeText(getApplicationContext(), "not taken", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(), "taken", Toast.LENGTH_SHORT).show();
}
cameraObject.release();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pic = (ImageView)findViewById(R.id.imageView1);
cameraObject = isCameraAvailiable();
showCamera = new ShowCamera(this, cameraObject);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(showCamera);
}
public void snapIt(View view){
cameraObject.takePicture(null, null, capturedIt);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Here is the ShowCamera class:
package com.example.camera1;
import java.io.IOException;
import android.content.Context;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class ShowCamera extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder holdMe;
private Camera theCamera;
public ShowCamera(Context context,Camera camera) {
super(context);
theCamera = camera;
holdMe = getHolder();
holdMe.addCallback(this);
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
try {
theCamera.setPreviewDisplay(holder);
theCamera.startPreview();
} catch (IOException e) {
}
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
}
}

There may be different reasons for Camera.startPreview() to throw RuntimeException. For example, it could be by set of preview size not to one of supported preview sizes.

Try to catch a top level Exception in the surfaceCreated method (instead of IOException) and call e.getMessage() in the exception block to get more information on the type of error.

Spinner problems with Sharedpreferences

Sorry,this is my first time to put questions in this site
My Function: I set two Buttons to restore and save the information in the Spinner and EditText with the function Sharedpreferences.
I execute the program at the first time. The program will appear the error state,if I click the Button "restore" to restore the information in Spinner. But I haven't met the problem when I restore the information in EditText.
This is the code in Spinner
private Spinner.OnItemSelectedListener getfeet = new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View v, int position,
long id) {
// TODO Auto-generated method stub
feet_out = parent.getSelectedItemPosition() + 2;
select_f = feet.getSelectedItemPosition(); //save the position you choose
Toast.makeText(MainActivity.this,
"you chose " + parent.getSelectedItem().toString(),
Toast.LENGTH_SHORT).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
};
private Spinner.OnItemSelectedListener getinch = new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View v, int position,
long id) {
// TODO Auto-generated method stub
inch_out = parent.getSelectedItemPosition();
select_i = inch.getSelectedItemPosition(); //save the position you choose
Toast.makeText(MainActivity.this,
"you chose " + parent.getSelectedItem().toString(),
Toast.LENGTH_SHORT).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
};
This is the code which executes the function of save in Sharedpreferences
private void save_() {
settings = getSharedPreferences("DATA", 0);
settings.edit().putInt("DATA_FEET", select_f) //store the position in DATA_FEET and DATA_INCH
.putInt("DATA_INCH", select_i)
.putString("DATA_WEIGHT", weight.getText().toString()).commit();
Toast.makeText(MainActivity.this, R.string.done, Toast.LENGTH_SHORT) //save done
.show();
}
This is the code which executes the function of restore in Sharedpreferences
private void restore_() {
feet.setSelection(settings.getInt("DATA_FEET", select_f)); //restore the position
inch.setSelection(settings.getInt("DATA_INCH", select_i));
weight.setText(settings.getString("DATA_WEIGHT", "EMPTY"));
}
My problem is that I can't use the function of restore at the program executing at the first time. Is there any solution to solve the problem?? Because it is normal in EditText,but it is abnormal in Spinner. Thanks :))
This is the state. :))
10-23 23:14:11.677: D/TextLayoutCache(26370): Using debug level: 0 - Debug Enabled: 0
10-23 23:14:11.747: D/libEGL(26370): loaded /system/lib/egl/libGLES_android.so
10-23 23:14:11.797: D/libEGL(26370): loaded /system/lib/egl/libEGL_mali.so
10-23 23:14:11.827: D/libEGL(26370): loaded /system/lib/egl/libGLESv1_CM_mali.so
10-23 23:14:11.827: D/libEGL(26370): loaded /system/lib/egl/libGLESv2_mali.so
10-23 23:14:11.887: D/OpenGLRenderer(26370): Enabling debug mode 0
10-23 23:14:16.762: D/AndroidRuntime(26370): Shutting down VM
10-23 23:14:16.762: W/dalvikvm(26370): threadid=1: thread exiting with uncaught exception (group=0x40aaa210)
10-23 23:14:16.802: E/AndroidRuntime(26370): FATAL EXCEPTION: main
10-23 23:14:16.802: E/AndroidRuntime(26370): java.lang.NullPointerException
10-23 23:14:16.802: E/AndroidRuntime(26370): at com.example.bmi.MainActivity.restore_(MainActivity.java:44)
10-23 23:14:16.802: E/AndroidRuntime(26370): at com.example.bmi.MainActivity.access$1(MainActivity.java:43)
10-23 23:14:16.802: E/AndroidRuntime(26370): at com.example.bmi.MainActivity$2.onClick(MainActivity.java:99)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.view.View.performClick(View.java:3574)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.view.View$PerformClick.run(View.java:14293)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.os.Handler.handleCallback(Handler.java:605)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.os.Handler.dispatchMessage(Handler.java:92)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.os.Looper.loop(Looper.java:137)
10-23 23:14:16.802: E/AndroidRuntime(26370): at android.app.ActivityThread.main(ActivityThread.java:4448)
10-23 23:14:16.802: E/AndroidRuntime(26370): at java.lang.reflect.Method.invokeNative(Native Method)
10-23 23:14:16.802: E/AndroidRuntime(26370): at java.lang.reflect.Method.invoke(Method.java:511)
10-23 23:14:16.802: E/AndroidRuntime(26370): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
10-23 23:14:16.802: E/AndroidRuntime(26370): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
10-23 23:14:16.802: E/AndroidRuntime(26370): at dalvik.system.NativeStart.main(Native Method)
This is the method to call the restore_()
private OnClickListener reback_1 = new OnClickListener() {
public void onClick(View v) {
restore_();
}
};
After I replaced the select_f and select_i into 0, it appeared the problem
10-24 00:01:30.957: D/TextLayoutCache(28836): Using debug level: 0 - Debug Enabled: 0
10-24 00:01:31.017: D/libEGL(28836): loaded /system/lib/egl/libGLES_android.so
10-24 00:01:31.037: D/libEGL(28836): loaded /system/lib/egl/libEGL_mali.so
10-24 00:01:31.057: D/libEGL(28836): loaded /system/lib/egl/libGLESv1_CM_mali.so
10-24 00:01:31.057: D/libEGL(28836): loaded /system/lib/egl/libGLESv2_mali.so
10-24 00:01:31.087: D/OpenGLRenderer(28836): Enabling debug mode 0
10-24 00:01:36.262: D/AndroidRuntime(28836): Shutting down VM
10-24 00:01:36.262: W/dalvikvm(28836): threadid=1: thread exiting with uncaught exception (group=0x40aaa210)
10-24 00:01:36.282: E/AndroidRuntime(28836): FATAL EXCEPTION: main
10-24 00:01:36.282: E/AndroidRuntime(28836): java.lang.NullPointerException
10-24 00:01:36.282: E/AndroidRuntime(28836): at com.example.bmi.MainActivity.restore_(MainActivity.java:44)
10-24 00:01:36.282: E/AndroidRuntime(28836): at com.example.bmi.MainActivity.access$1(MainActivity.java:43)
10-24 00:01:36.282: E/AndroidRuntime(28836): at com.example.bmi.MainActivity$2.onClick(MainActivity.java:99)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.view.View.performClick(View.java:3574)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.view.View$PerformClick.run(View.java:14293)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.os.Handler.handleCallback(Handler.java:605)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.os.Handler.dispatchMessage(Handler.java:92)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.os.Looper.loop(Looper.java:137)
10-24 00:01:36.282: E/AndroidRuntime(28836): at android.app.ActivityThread.main(ActivityThread.java:4448)
10-24 00:01:36.282: E/AndroidRuntime(28836): at java.lang.reflect.Method.invokeNative(Native Method)
10-24 00:01:36.282: E/AndroidRuntime(28836): at java.lang.reflect.Method.invoke(Method.java:511)
10-24 00:01:36.282: E/AndroidRuntime(28836): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
10-24 00:01:36.282: E/AndroidRuntime(28836): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
10-24 00:01:36.282: E/AndroidRuntime(28836): at dalvik.system.NativeStart.main(Native Method)
10-24 00:01:37.803: I/Process(28836): Sending signal. PID: 28836 SIG: 9

You are using the SharedPrefs wrong.
feet.setSelection(settings.getInt("DATA_FEET", select_f));
when you try to fetch the integer-value from sharedPref, you get returned null! because i think that you misunderstand how it is done:
settings.getInt("myKey", defaultValue);
returns you the value for the key "myKey". if "myKey" has no value set, then it returns you the "defaultValue". In your case it returns the current value of "select_f". And as it looks, the value of select_f is null, when you run your application for the first time.
So you have to decide whether to initialize "select_f" before you retrieve the sharedPrefs or you enter another defaultValue here.

Android App crashes right on start

I have an app that's supposed to get some string from a server depending on the webpage, and it crashes every time I run it. I don't understand how to even debug it, and I've tried numerous changes. It started crashing ever since I messed with the GUI, and added the ability to switch views if that provides any sort of help.
Here is the code:
public class MainActivity extends Activity implements TextToSpeech.OnInitListener, OnClickListener{
private WebView mWebview;
EditText addressBar;
String currentWebpage = "http://www.aljazeera.com/news/americas/2013/07/20137113200544375.html";
LinearLayout viewGroup = (LinearLayout) findViewById(R.id.linearview);
View main = (View) findViewById(R.layout.activity_main);
View readOut = (View) findViewById(R.layout.read_out);
#Override
public void onCreate(Bundle savedInstanceState) {
System.out.println("Showing Activity_Main...");
viewGroup.addView(View.inflate(this, R.layout.activity_main, null));
super.onCreate(savedInstanceState);
//setContentView(R.menu.main);
addressBar = (EditText)findViewById(R.id.addressBar);
addressBar.setText(currentWebpage);
mWebview = (WebView)findViewById(R.id.webview);
mWebview.getSettings().setJavaScriptEnabled(true); // enables javascript
mWebview.setWebViewClient(new WebViewClient());
System.out.println("Loading Webpage...");
mWebview.loadUrl(currentWebpage);
}
public void speakOut(String text) {
TextToSpeech tts = new TextToSpeech(this, this);
System.out.println("Speaking");
if(tts.isLanguageAvailable(Locale.ENGLISH) != -1){
tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);
}
}
public int speakFull(String text){
switchToRead();
String[] sentences = text.split("\n|\\.(?!\\d)|(?<!\\d)\\."); // Regex that splits the body of text into the sentences of that body which are stored in a String array.
for(int i = 0; i < sentences.length; i++){
speakOut(sentences[i]);
if(i == sentences.length - 1){
return 1;
}
}
return 0;
}
public String getText(String webPage) throws ParseException, IOException{
HttpResponse response = null;
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://someserver.net:8080/" + webPage));
response = client.execute(request);
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
String responseBody = "No text found on webpage.";
int responseCode = response.getStatusLine().getStatusCode();
switch(responseCode) {
case 200:
HttpEntity entity = response.getEntity();
if(entity != null) {
responseBody = EntityUtils.toString(entity);
}
}
System.out.println("Returning Response..");
System.out.println(responseBody);
return responseBody;
}
#Override
public void onInit(int status) {
// TODO Auto-generated method stub
}
private class tts extends AsyncTask<String, Void, String>{//Async http request to get text
#Override
protected String doInBackground(String... arg0) {
try {
System.out.println("Running seperate thread for TTS.");
int complete = 0;
while(complete == 0){
System.out.println("Speaking full..");
complete = speakFull(getText(mWebview.getUrl()));
}
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result){
}
}
public void clickPlay(View v){
new tts().execute("");
}
public void clickGo(View v){
if(addressBar.getText() != null){
currentWebpage = addressBar.getText().toString();
System.out.println("Current webpage changed to: " + currentWebpage);
mWebview.loadUrl(currentWebpage);
}
}
public void clickPause(View v){
System.out.println("Clicked pause.");
}
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
public void switchToRead(){// Switches to the reading view which displays the text that the tts engine reads off.
System.out.println("Swtiching view to Read.");
viewGroup.removeView(main);
viewGroup.addView(View.inflate(this, R.layout.read_out, null));
}
public void switchToMain(){
System.out.println("Switching view to Main.");
viewGroup.removeView(readOut);
viewGroup.addView(View.inflate(this, R.layout.activity_main, null));
}
}
Also here are the numerous errors I encounter when launching my app:
08-01 14:53:10.210: E/Trace(812): error opening trace file: No such file or directory (2)
08-01 14:53:10.600: D/AndroidRuntime(812): Shutting down VM
08-01 14:53:10.631: W/dalvikvm(812): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-01 14:53:10.660: E/AndroidRuntime(812): FATAL EXCEPTION: main
08-01 14:53:10.660: E/AndroidRuntime(812): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.webview/com.example.webview.MainActivity}: java.lang.NullPointerException
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.os.Looper.loop(Looper.java:137)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-01 14:53:10.660: E/AndroidRuntime(812): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 14:53:10.660: E/AndroidRuntime(812): at java.lang.reflect.Method.invoke(Method.java:511)
08-01 14:53:10.660: E/AndroidRuntime(812): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-01 14:53:10.660: E/AndroidRuntime(812): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-01 14:53:10.660: E/AndroidRuntime(812): at dalvik.system.NativeStart.main(Native Method)
08-01 14:53:10.660: E/AndroidRuntime(812): Caused by: java.lang.NullPointerException
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.Activity.findViewById(Activity.java:1839)
08-01 14:53:10.660: E/AndroidRuntime(812): at com.example.webview.MainActivity.<init>(MainActivity.java:39)
08-01 14:53:10.660: E/AndroidRuntime(812): at java.lang.Class.newInstanceImpl(Native Method)
08-01 14:53:10.660: E/AndroidRuntime(812): at java.lang.Class.newInstance(Class.java:1319)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
08-01 14:53:10.660: E/AndroidRuntime(812): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
08-01 14:53:10.660: E/AndroidRuntime(812): ... 11 more
08-01 14:53:27.439: D/AndroidRuntime(860): Shutting down VM
08-01 14:53:27.439: W/dalvikvm(860): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-01 14:53:27.449: E/AndroidRuntime(860): FATAL EXCEPTION: main
08-01 14:53:27.449: E/AndroidRuntime(860): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.webview/com.example.webview.MainActivity}: java.lang.NullPointerException
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.os.Looper.loop(Looper.java:137)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-01 14:53:27.449: E/AndroidRuntime(860): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 14:53:27.449: E/AndroidRuntime(860): at java.lang.reflect.Method.invoke(Method.java:511)
08-01 14:53:27.449: E/AndroidRuntime(860): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-01 14:53:27.449: E/AndroidRuntime(860): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-01 14:53:27.449: E/AndroidRuntime(860): at dalvik.system.NativeStart.main(Native Method)
08-01 14:53:27.449: E/AndroidRuntime(860): Caused by: java.lang.NullPointerException
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.Activity.findViewById(Activity.java:1839)
08-01 14:53:27.449: E/AndroidRuntime(860): at com.example.webview.MainActivity.<init>(MainActivity.java:39)
08-01 14:53:27.449: E/AndroidRuntime(860): at java.lang.Class.newInstanceImpl(Native Method)
08-01 14:53:27.449: E/AndroidRuntime(860): at java.lang.Class.newInstance(Class.java:1319)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
08-01 14:53:27.449: E/AndroidRuntime(860): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
08-01 14:53:27.449: E/AndroidRuntime(860): ... 11 more

Move your view initialization inside onCreate after setContentView
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylayout);
LinearLayout viewGroup = (LinearLayout) findViewById(R.id.linearview);
...// rest of the code

Hiding Keyboard on Android crashes app

When I try to run this line in order to hide the keyboard (I get the InputMethodManager):
this.context = context;
InputMethodManager mgr = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE); //this line crashes the app
What should I do to fix it?
(I am running it from a fragment by the way)
Crash Log:
11-03 16:20:26.700: D/AndroidRuntime(2809): Shutting down VM
11-03 16:20:26.700: W/dalvikvm(2809): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
11-03 16:20:26.710: E/AndroidRuntime(2809): FATAL EXCEPTION: main
11-03 16:20:26.710: E/AndroidRuntime(2809): java.lang.NullPointerException
11-03 16:20:26.710: E/AndroidRuntime(2809): at co.emuze.tabtest1.Tab1$1.onClick(Tab1.java:32)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.view.View.performClick(View.java:4084)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.view.View$PerformClick.run(View.java:16966)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.os.Handler.handleCallback(Handler.java:615)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.os.Handler.dispatchMessage(Handler.java:92)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.os.Looper.loop(Looper.java:137)
11-03 16:20:26.710: E/AndroidRuntime(2809): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-03 16:20:26.710: E/AndroidRuntime(2809): at java.lang.reflect.Method.invokeNative(Native Method)
11-03 16:20:26.710: E/AndroidRuntime(2809): at java.lang.reflect.Method.invoke(Method.java:511)
11-03 16:20:26.710: E/AndroidRuntime(2809): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-03 16:20:26.710: E/AndroidRuntime(2809): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-03 16:20:26.710: E/AndroidRuntime(2809): at dalvik.system.NativeStart.main(Native Method)
Full on click method:
public void onClick(View v) {
text1.setText(editText1.getText().toString());
InputMethodManager mgr = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromWindow(editText1.getWindowToken(), 0);
}

It would appear context is null - you show the line this.context = context, and if the right hand side context is not a variable local to that method you're doing nothing. I think what you may be looking for is context = getApplicationContext()

Dont forget to use try catch blog because in case when your keyboard not open and if you use key key board hide code app crashed
User below code in Fragment
try {
InputMethodManager imm = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
} catch (Exception e) {
// TODO: handle exception
}