R cannot resolved to a variable in eclipse android [duplicate]

R cannot resolved to a variable in eclipse android [duplicate] - java

This question already has answers here:
R cannot be resolved - Android error
(108 answers)
Closed 6 years ago.
This is my xml code R file is not generating please tell me where is the error and why R file is not generating
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#333333"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin" >
<TextView
android:id="#+id/SongName"
android:layout_width="wrap_content"
android:text="#string/songName"
android:layout_height="wrap_content"/>
<ImageView
android:id="#+id/s_mp3Image"
android:layout_width="match_parent"
android:layout_height="200dp"
android:padding="30dp"
android:contentDescription="#string/music"
android:src="#drawable/music"
android:background="#ffffff"
android:layout_margin="30dp" />
<TextView
android:id="#+id/songDuration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/songDuration"
android:layout_gravity="center"/>
<SeekBar
android:id="#+id/s_seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<ImageButton
android:id="#+id/s_media_rew"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:onClick="rewind"
android:contentDescription="#string/ic_media_rew"
android:src="#android:drawable/ic_media_rew" />
<ImageButton
android:id="#+id/s_media_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:onClick="pause"
android:contentDescription="#string/media_pause"
android:src="#android:drawable/ic_media_pause" />
<ImageButton
android:id="#+id/s_media_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:onClick="play"
android:contentDescription="#string/ic_media_play"
android:src="#android:drawable/ic_media_play" />
<ImageButton
android:id="#+id/s_media_ff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:onClick="forward"
android:contentDescription="#string/ic_media_ff"
android:src="#android:drawable/ic_media_ff" />
</LinearLayout>
and this is my java code
package com.example.androidmediaplayer;
import java.util.concurrent.TimeUnit;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.VideoView;
public class MainActivity extends Activity {
private MediaPlayer mediaPlayer;
public TextView songName, duration;
private double timeElapsed = 0, finalTime = 0;
private int forwardTime = 2000, backwardTime = 2000;
private Handler durationHandler = new Handler();
private SeekBar seekbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//set the layout of the Activity
setContentView(R.layout.activity_list_item); //here R file has problem
//initialize views
initializeViews();
}
public void initializeViews(){
songName=(TextView)findViewById(R.id.SongName); //here R file has problem
mediaPlayer = MediaPlayer.create(this, R.raw.sample); //here
finalTime = mediaPlayer.getDuration();
duration = (TextView) findViewById(R.id.songDuration); //here
seekbar = (SeekBar) findViewById(R.id.s_seekBar); //here
songName.setText("Sample_Song.mp3");
seekbar.setMax((int) finalTime);
seekbar.setClickable(false);
}
// play mp3 song
public void play(View view) {
mediaPlayer = new MediaPlayer();
mediaPlayer.start();
timeElapsed = mediaPlayer.getCurrentPosition();
seekbar.setProgress((int) timeElapsed);
durationHandler.postDelayed(updateSeekBarTime, 100);
}
//handler to change seekBarTime
#SuppressLint("NewApi")
private Runnable updateSeekBarTime = new Runnable() {
#SuppressLint("NewApi")
public void run() {
//get current position
timeElapsed = mediaPlayer.getCurrentPosition();
//set seekBar progress
seekbar.setProgress((int) timeElapsed);
//set time remaining
double timeRemaining = finalTime - timeElapsed;
duration.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining), TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining))));
//repeat yourself that again in 100 milliseconds
durationHandler.postDelayed(this, 100);
}
};
// pause mp3 song
public void pause(View view) {
mediaPlayer.pause();
}
// go forward at forwardTime seconds
public void forward(View view) {
//check if we can go forward at forwardTime seconds before song
if ((timeElapsed + forwardTime) <= finalTime) {
timeElapsed = timeElapsed + forwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
// go backwards at backwardTime seconds
public void rewind(View view) {
//check if we can go back at backwardTime seconds after song starts
if ((timeElapsed - backwardTime) > 0) {
timeElapsed = timeElapsed - backwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
}
This is my code R file is not generating please tell me where is the error and why R file is not generating
This is my xml code R file is not generating please tell me where is the error and why R file is not generating This is my xml code R file is not generating please tell me where is the error and why R file is not generating This is my xml code R file is not generating please tell me where is the error and why R file is not generating

You should try cleaning your project !!

Try Clean your Project.
OR
Restart Eclipse.
Or
Check with All XML Resources you have used. Is their any missing things in your XML.
This case mostly happens when you have Something wrong with your XML Resources you are using.

Related

Making app to count time since first time used

How to make an app to count the time since the first time opened? I have no idea which class to use. Is it possible to achieve this with a stopwatch or something similar? Can someone pls share some code? I don't know what to search on the internet just have an idea of what I want to build. Or just tell me an idea with what I can achieve this and how?
statisticLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (plusiliminus==0){
Toast.makeText(getActivity(),R.string.toaststatistic,Toast.LENGTH_SHORT).show();
} else {
Fragment fragmentstatistic=new Statistic();
FragmentTransaction transaction=getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frameLayout,fragmentstatistic).commit();
}
}
});

As far as I could understand, you need persistent storage for the time when it was first used. I think SharedPreferences is a good way of storing this in your case.
In the onCreate function of your launcher activity, you might get the System.currentTimeInMillis() and store it in the SharedPreferences as stated here.
Then when you need to reset the time, you just have to clear the value in the SharedPreferences and can set a new value again.
I hope this gives you an idea of your implementation.

You have basically to do two things.
Get the current time when you start the app, or press a button using something like
Date currentTime = Calendar.getInstance().getTime();
This is a good beginning, you get the time, then you have to parse this time in a format you want to show to the user then you manage a stop and reset button as showed for instance in this tutorial
So you build a TextView and you show in real time the seconds, parsed in the way you need
import android.os.Handler;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView timer ;
Button start, pause, reset;
long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L ;
Handler handler;
int Seconds, Minutes, MilliSeconds ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timer = (TextView)findViewById(R.id.tvTimer);
start = (Button)findViewById(R.id.btStart);
pause = (Button)findViewById(R.id.btPause);
reset = (Button)findViewById(R.id.btReset);
handler = new Handler() ;
start.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
StartTime = SystemClock.uptimeMillis();
handler.postDelayed(runnable, 0);
reset.setEnabled(false);
}
});
pause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
TimeBuff += MillisecondTime;
handler.removeCallbacks(runnable);
reset.setEnabled(true);
}
});
reset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
MillisecondTime = 0L ;
StartTime = 0L ;
TimeBuff = 0L ;
UpdateTime = 0L ;
Seconds = 0 ;
Minutes = 0 ;
MilliSeconds = 0 ;
timer.setText("00:00:00");
}
});
}
public Runnable runnable = new Runnable() {
public void run() {
MillisecondTime = SystemClock.uptimeMillis() - StartTime;
UpdateTime = TimeBuff + MillisecondTime;
Seconds = (int) (UpdateTime / 1000);
Minutes = Seconds / 60;
Seconds = Seconds % 60;
MilliSeconds = (int) (UpdateTime % 1000);
timer.setText("" + Minutes + ":"
+ String.format("%02d", Seconds) + ":"
+ String.format("%03d", MilliSeconds));
handler.postDelayed(this, 0);
}
};
}
and the view of activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary"
tools:context="in.amitsin6h.stopwatch.MainActivity">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:paddingBottom="90dp">
<TextView
android:text="00:00:00"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/tvTimer"
android:textSize="50dp"
android:textStyle="bold"
android:textColor="#ffffff"
android:layout_marginTop="120dp"
android:paddingBottom="50dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:text="Start"
android:background="#ffffff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tvTimer"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="41dp"
android:id="#+id/btStart" />
<Button
android:text="Pause"
android:background="#ffffff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/btPause"
android:layout_alignBaseline="#+id/btStart"
android:layout_alignBottom="#+id/btStart"
android:layout_centerHorizontal="true" />
<Button
android:text="Reset"
android:background="#ffffff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/btPause"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:id="#+id/btReset" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>

Crash on creating a list size >1 to pass into list view (Index out of bounds)

Im trying to create a dice rolling tool as part of a larger application. However if i try to roll more than 1 dice in my dice roll function the application crashes. Howver as im new to Java i cant seem to find the cause of the index out of bounds error.
DiceActvity.Java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RadioButton;
import java.util.ArrayList;
import java.util.List;
public class DiceActivity extends AppCompatActivity
{
ListView LVDiceList;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dice);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Radio button
final RadioButton rbGreater = (RadioButton) findViewById(R.id.greaterThanRadioB);
final RadioButton rbLess = (RadioButton) findViewById(R.id.lessThanRadioB);
//Edit boxes
final EditText txtDiceType = (EditText) findViewById(R.id.diceTypeEdTxt);
final EditText txtNumberDice = (EditText) findViewById(R.id.numDiceEdTxt);
final EditText txtFilterNum = (EditText) findViewById(R.id.filterNumEdTxt);
//Buttons
Button btnRoll = (Button) findViewById(R.id.rollButton);
Button btnDiscard = (Button) findViewById(R.id.discardButton);
//Display Array
final List<Integer> diceList = new ArrayList<Integer>(10);
//Array Adapter
final ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this, android.R.layout.simple_spinner_item, diceList);
//Set adapter
LVDiceList = (ListView) findViewById(R.id.diceResultListV);
LVDiceList.setAdapter(adapter);
//Roll the dice
btnRoll.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
//Hide soft keyboard
Utils.hideKeyboard(DiceActivity.this);
//Validation of fields
//If both fields >0
if (Integer.valueOf(txtDiceType.getText().toString()) > 0 && Integer.valueOf(txtNumberDice.getText().toString()) > 0)
{
int number = Integer.valueOf(txtNumberDice.getText().toString());
int sides = Integer.valueOf(txtDiceType.getText().toString());
//Populate array
for (int i=0;i <number; i++)
{
diceList.add(i, rollDice(sides,number).get(i));
}
//Update the list view
adapter.notifyDataSetChanged();
}
return;
}
});
//Clear the list of results
btnDiscard.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
diceList.clear();
adapter.notifyDataSetChanged();
}
});
//Radio Button Validation
rbGreater.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
if(rbGreater.isChecked() == true)
{
rbLess.setChecked(false);
}
}
});
rbLess.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
if(rbLess.isChecked() == true)
{
rbGreater.setChecked(false);
};
}
});
}
//Returns a list of rolled dice results
private List<Integer> rollDice(int chance, int amount)
{
final List<Integer> rollArray = new ArrayList<Integer>(amount);
int result;
//Gives a random number between 1 and X,Y number of times
{
//BASE Equation||Min + (int)(Math.random() * ((Max - Min) + 1))
//1 = minimum roll
result = 1 + (int) (Math.random() * ((chance - 1) + 1));
rollArray.add(result);
}
return rollArray;
}
}
content_dice.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="garethgriffiths.tabletopcompanion.DiceActivity"
tools:showIn="#layout/activity_dice">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/textView_NumDice"
android:id="#+id/numDiceTextV"
android:layout_alignBottom="#+id/numDiceEdTxt"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:textSize="25dp"
android:textStyle="bold"
android:textAlignment="gravity"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="4"
android:id="#+id/numDiceEdTxt"
android:maxLength="3"
android:text="#string/edText_NumDice"
android:gravity="right"
android:selectAllOnFocus="true"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/numDiceTextV"
android:layout_toEndOf="#+id/numDiceTextV"
android:numeric="integer"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/textView_DiceType"
android:id="#+id/diceTypeTextV"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="#+id/numDiceTextV"
android:layout_alignBottom="#+id/diceTypeEdTxt"
android:layout_toLeftOf="#+id/diceTypeEdTxt"
android:layout_toStartOf="#+id/diceTypeEdTxt"
android:textSize="25dp"
android:textStyle="bold"
android:textAlignment="gravity"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="4"
android:id="#+id/diceTypeEdTxt"
android:maxLength="2"
android:text="#string/edText_DiceType"
android:layout_below="#+id/numDiceEdTxt"
android:layout_alignLeft="#+id/numDiceEdTxt"
android:layout_alignStart="#+id/numDiceEdTxt"
android:gravity="right"
android:selectAllOnFocus="true"
android:numeric="integer"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/radioB_LessThan"
android:id="#+id/lessThanRadioB"
android:layout_above="#+id/discardButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="36dp"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/radioB_GreaterThan"
android:id="#+id/greaterThanRadioB"
android:layout_alignTop="#+id/lessThanRadioB"
android:layout_toRightOf="#+id/lessThanRadioB"
android:layout_toEndOf="#+id/lessThanRadioB"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="4"
android:maxLength="3"
android:id="#+id/filterNumEdTxt"
android:layout_alignTop="#+id/greaterThanRadioB"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:text="#string/edText_NumFilter"
android:gravity="center"
android:selectAllOnFocus="true"
android:numeric="integer"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_Discard"
android:id="#+id/discardButton"
android:layout_alignTop="#+id/rollButton"
android:layout_toLeftOf="#+id/rollButton"
android:layout_toStartOf="#+id/rollButton"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_Roll"
android:id="#+id/rollButton"
android:layout_marginTop="108dp"
android:layout_below="#+id/diceTypeTextV"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/diceResultListV"
android:scrollIndicators="right"
android:visibility="visible"
android:layout_below="#+id/discardButton"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
Heres a small Class used to hide softkeyboard thats called in DiceActivity
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
/**
* http://stackoverflow.com/questions/1109022/close-hide-the-android-soft-keyboard
* Used to close soft keyboard
*/
public class Utils
{
public static void hideKeyboard(Activity activity)
{
// Check if no view has focus:
View view = activity.getCurrentFocus();
if (view != null)
{
InputMethodManager inputManager = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}
}

Your method private List<Integer> rollDice(int chance, int amount) returns a list of Integer. And according to your comment inside the method it should have multiple numbers in it.
But this method always returns only one number.
Now you invoke this method here:
for (int i=0;i <number; i++)
{
diceList.add(i, rollDice(sides,number).get(i));
}
You are invoking this method in a loop. Storing the results in a NEW list.
You get an exception because in the second loop get(i) is 1 and there is only 1 entry in this list on index 0.
To correct this is should read: .get(0)
Also this kind of implementation is very messy. Please take a paper and a pencil to figure it out.

Android media player with list view and service

I have implemented an Android media player that is clicking on songs text view will display the layout. The layout displayed with play pause .. and clicking on play stop works well. Here I am thinking in users perspective to implement the below.
Clicking on songs text view should display the songs in list view and in the bottom of the layout small controls should display with play pause and stop
It should play even when other application is opened.
To achieve the point 2 I used media player service and for point 1, I used a `ListView' but not successfully implemented. Below is the code which play the song and and go till end. From this point can anyone please help me to implement list view songs with service?
public class Songs extends Activity {
private MediaPlayer mediaPlayer;
public TextView songName, duration;
private double timeElapsed = 0, finalTime = 0;
private int forwardTime = 2000, backwardTime = 2000;
private Handler durationHandler = new Handler();
private SeekBar seekbar;
private Context context;
private int getCurrentPos=0;
private int[] songs={R.raw.sample_song,R.raw.sleepaway};
#Override
protected void onCreate(Bundle savedInstanceState) {
context=getApplicationContext();
super.onCreate(savedInstanceState);
setContentView(R.layout.mediaplayer);
initializeViews();
}
public void initializeViews(){
songName = (TextView) findViewById(R.id.songName);
mediaPlayer = MediaPlayer.create(this, songs[getCurrentPos]);
mediaPlayer.setLooping(true);
finalTime = mediaPlayer.getDuration();
duration = (TextView) findViewById(R.id.songDuration);
seekbar = (SeekBar) findViewById(R.id.seekBar);
songName.setText("Sample_Song.mp3");
seekbar.setMax((int) finalTime);
seekbar.setClickable(false);
}
// play mp3 song
public void play(View view) {
mediaPlayer.start();
timeElapsed = mediaPlayer.getCurrentPosition();
seekbar.setProgress((int) timeElapsed);
durationHandler.postDelayed(updateSeekBarTime, 100);
}
private Runnable updateSeekBarTime = new Runnable() {
public void run() {
//get current position
timeElapsed = mediaPlayer.getCurrentPosition();
//set seekbar progress
seekbar.setProgress((int) timeElapsed);
//set time remaing
double timeRemaining = finalTime - timeElapsed;
// duration.setText(String.format("%d min, %d sec", 12, TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - 12));
//repeat yourself that again in 100 miliseconds
durationHandler.postDelayed(this, 100);
}
};
// pause mp3 song
public void pause(View view) {
mediaPlayer.pause();
}
// go forward at forwardTime seconds
public void forward(View view) {
//check if we can go forward at forwardTime seconds before song endes
if ((timeElapsed + forwardTime) <= finalTime) {
timeElapsed = timeElapsed + forwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
// go backwards at backwardTime seconds
public void rewind(View view) {
//check if we can go back at backwardTime seconds after song starts
if ((timeElapsed - backwardTime) > 0) {
timeElapsed = timeElapsed - backwardTime;
//seek to the exact second of the track
mediaPlayer.seekTo((int) timeElapsed);
}
}
// Go to next song
public void next(View view) throws IOException{
try {
mediaPlayer.reset();
mediaPlayer = MediaPlayer.create(this, songs[getSongPosition()]);
mediaPlayer.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private int getSongPosition(){
if(getCurrentPos==songs.length-1){
getCurrentPos=0;
}else if(getCurrentPos==0){
getCurrentPos=getCurrentPos+1;
}else{
getCurrentPos=getCurrentPos+1;
}
return getCurrentPos;
}
}
Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#333333"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin" >
<TextView
android:id="#+id/songName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="songName" />
<ImageView
android:id="#+id/mp3Image"
android:layout_width="match_parent"
android:layout_height="200dp"
android:padding="30dp"
android:src="#drawable/music"
android:background="#ffffff"
android:layout_margin="30dp" />
<TextView
android:id="#+id/songDuration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="songDuration" />
<SeekBar
android:id="#+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<ImageButton
android:id="#+id/media_rew"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="rewind"
android:src="#android:drawable/ic_media_rew" />
<ImageButton
android:id="#+id/media_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="pause"
android:src="#android:drawable/ic_media_pause" />
<ImageButton
android:id="#+id/media_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="play"
android:src="#android:drawable/ic_media_play" />
<ImageButton
android:id="#+id/media_ff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="forward"
android:src="#android:drawable/ic_media_ff" />
<ImageButton
android:id="#+id/media_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:onClick="next"
android:src="#android:drawable/ic_media_next" />
</LinearLayout>
</LinearLayout>

Android RunTime Error Eclipse

I've been learning some java for android by reading and trying codes, and whenever I start the application on android it crashes. In the LogCat, this shows:
08-09 16:13:24.033: E/AndroidRuntime(839): ... 11 more
Here is my activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="Brews: " />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="None"
android:gravity="end"
android:textSize="20sp"
android:id="#+id/brew_count_label" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:padding="10dip">
<Button
android:id="#+id/brew_time_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textSize="40sp" />
<TextView
android:id="#+id/brew_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0:00"
android:textSize="40sp"
android:padding="10dip" />
<Button
android:id="#+id/brew_time_up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:textSize="40sp" />
</LinearLayout>
<Button
android:id="#+id/brew_start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="Start" />
</LinearLayout>
And here is my MainActivity.java:
package com.example.basketball;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity implements OnClickListener {
/** Properties **/
protected Button brewAddTime;
protected Button brewDecreaseTime;
protected Button startBrew;
protected TextView brewCountLabel;
protected TextView brewTimeLabel;
protected int brewTime = 3;
protected CountDownTimer brewCountDownTimer;
protected int brewCount = 0;
protected boolean isBrewing = false;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
// Connect interface elements to properties
brewAddTime = (Button) findViewById(R.id.brew_time_up);
brewDecreaseTime = (Button) findViewById(R.id.brew_time_down);
startBrew = (Button) findViewById(R.id.brew_start);
brewCountLabel = (TextView) findViewById(R.id.brew_count_label);
brewTimeLabel = (TextView) findViewById(R.id.brew_time);
// Setup ClickListeners
brewAddTime.setOnClickListener(this);
brewDecreaseTime.setOnClickListener(this);
startBrew.setOnClickListener(this);
// Set the initial brew values
setBrewCount(0);
setBrewTime(3);
}
/** Methods **/
/**
* Set an absolute value for the number of minutes to brew. Has no effect if a brew
* is currently running.
* #param minutes The number of minutes to brew.
*/
public void setBrewTime(int minutes) {
if(isBrewing)
return;
brewTime = minutes;
if(brewTime < 1)
brewTime = 1;
brewTimeLabel.setText(String.valueOf(brewTime) + "m");
}
/**
* Set the number of brews that have been made, and update the interface.
* #param count The new number of brews
*/
public void setBrewCount(int count) {
brewCount = count;
brewCountLabel.setText(String.valueOf(brewCount));
}
/**
* Start the brew timer
*/
public void startBrew() {
// Create a new CountDownTimer to track the brew time
brewCountDownTimer = new CountDownTimer(brewTime * 60 * 1000, 1000) {
#Override
public void onTick(long millisUntilFinished) {
brewTimeLabel.setText(String.valueOf(millisUntilFinished / 1000) + "s");
}
#Override
public void onFinish() {
isBrewing = false;
setBrewCount(brewCount + 1);
brewTimeLabel.setText("Brew Up!");
startBrew.setText("Start");
}
};
brewCountDownTimer.start();
startBrew.setText("Stop");
isBrewing = true;
}
/**
* Stop the brew timer
*/
public void stopBrew() {
if(brewCountDownTimer != null)
brewCountDownTimer.cancel();
isBrewing = false;
startBrew.setText("Start");
}
/** Interface Implementations **/
/* (non-Javadoc)
* #see android.view.View.OnClickListener#onClick(android.view.View)
*/
public void onClick(View v) {
if(v == brewAddTime)
setBrewTime(brewTime + 1);
else if(v == brewDecreaseTime)
setBrewTime(brewTime -1);
else if(v == startBrew) {
if(isBrewing)
stopBrew();
else
startBrew();
}
}
}
Anyone knows how to fix this error?
Please help.

Please uncomment setContentView(R.layout.main); and change that line to setContentView(R.layout.activity_main); in
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);

How to show two splash screen one by one in android?

I want to show two splash screens one by one. First to be aways static second will be change every time when user login. I do my second splash screen to change every time, but I dont know how to set a first static splash screen.
This is my .java file
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import android.os.Bundle;
import android.widget.ImageView;
import android.app.Activity;
import android.content.Intent;
public class SplashScreen extends DefaultActivity {
int timeout = 2000; // Choose the delay (1000 = 1 second)
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
setFonts();
// Randomise a background
int[] yourListOfImages= {R.drawable.test, R.drawable.test1, R.drawable.test2, R.drawable.test3};
Random random = new Random(System.currentTimeMillis());
int posOfImage = random.nextInt(yourListOfImages.length);
ImageView imageView= (ImageView) findViewById(R.id.imageView1);
imageView.setBackgroundResource(yourListOfImages[posOfImage]);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
//Redirecting to the home page
Intent redirect = new Intent(getApplicationContext(), LoginActivity.class);
startActivity(redirect);
finish();
}
}, timeout);
}
}
and this is .xml fail
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/root"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".SplashScreen" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:contentDescription="#string/contentDescription"
android:background="#android:color/white" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:contentDescription="#string/contentDescription"
android:background="#android:color/white" />
<TextView
android:id="#+id/textViewSplash"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/imageView1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="45dp"
android:textColor="#FFFFFF"
android:textSize="25sp"
android:tag="helvetica"
android:text="#string/splash_intro" />
</RelativeLayout>

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

R cannot resolved to a variable in eclipse android [duplicate] - java

You should try cleaning your project !!

Try Clean your Project. OR Restart Eclipse. Or Check with All XML Resources you have used. Is their any missing things in your XML. This case mostly happens when you have Something wrong with your XML Resources you are using.

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