I am trying to change the application background color, and the font type via theme when a preference is changed in the prefs area.
So far I have the preferences working but when I put the listener in, it just does not get called. I am testing using toasts to see if it appears.
My Code:
package alertssystem.lsa13tafeproj.lsa13.resistorcalculator;
import android.app.ActionBar;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.widget.RelativeLayout;
import android.widget.Toast;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.PreferenceChangeListener;
public class Prefs extends PreferenceActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content, new PreferencesFragment()).commit();
}
#Override
public void onBackPressed()
{
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
public static class PreferencesFragment extends PreferenceFragment
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
}
There is no changeListener in above code as none of the solutions I found worked, can someone please tell me how I can implement this into this.
The user clicks on the ListPreference and it has the 2 options I have inserted, but nothing happens when new option is selected.
This works for me:
public class MyPreferenceFragment extends PreferenceFragment implements
OnSharedPreferenceChangeListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
PreferenceManager.getDefaultSharedPreferences(getActivity()).registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onDestroy() {
PreferenceManager.getDefaultSharedPreferences(getActivity()).unregisterOnSharedPreferenceChangeListener(this);
super.onDestroy();
}
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
// Toast
}
}
Make sure you register your listener before changing the pref, and not unregistering it until you do.
Related
Having issues with the line I labelled. Tried multiple different suggestions but none seem to fix the issue, anyone has anymore suggestions?
package connect2you.com;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
findViewById(R.id.textViewSignup).setOnClickListener(this); // error on this line
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.textViewSignup:
startActivity(new Intent(this, SignUpActivity.class));
break;
}
}
}
Put your call tobfindViewById() inside a method. You can't run code outside of methods.
I recently use android studio instead of eclipse.
but somthing is wrong!
these are main java code that run currectly in eclipse but now get errors!
package com.example.amir.myapplicationeeee;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
startActivity(new Intent(getApplicationContext(),Main2Activity.class));
finish();
}
});
setOnClickListener is hilighed red and error ";" excepted showed when want to runnin app in virtual device
If the code you provide here is exactly the same as you have in your project, then you should just add '}' on the end of your code - it closes the MainActivity class.
You should also have evertyhing implemented inside onCreate() method.
So it should look like:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
startActivity(new
Intent(this,Main2Activity.class));
finish();
}
});
}
}
I must write a program with android which can find other ssid's and show them. I desinged it with 2 xml pages. I create an imagebutton in page2 and want to make a relation between imagebutton and searching method. It means i want to click on imagebutton and seaching method begin it's work and search ssid's and show them...
My problem is, I download my search method and because of that i can not recognize which method i must call on my setonclick method that i write for an imagebutton in second page? I try to create another class seperately for search method and call it from the second class of page2.
but i dont know how can i make a relation between these 2 calss(i mean the second and third class). Or i must write the method of searching and on click of my imagebutton in one class?
Thanks for your suggestion.this is the code that i was copy:
import java.util.Date;
import java.util.List;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class wifiScan extends Activity {
private class WifiReceiver extends BroadcastReceiver{
#Override
public void onReceive(Context c, Intent intent) {
List<ScanResult> results = wifi.getScanResults();
Date tempDate=new Date();
String info=testNumber+" "+(tempDate.getTime()-testDate.
getTime()) +" "+results.size();
Log.i("wifiScan", info);
wifiText.setText(info);
testNumber++;
testDate=new Date();
wifi.startScan();
}
}
private TextView wifiText;
private WifiManager wifi;
private WifiReceiver receiver;
private Date testDate;
private static int testNumber=0;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
testNumber=0;
wifiText = (TextView) findViewById(R.id.wifiText);
receiver=new WifiReceiver();
registerReceiver(receiver, new IntentFilte
(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifi =(WifiManager)getSystemService(Context.WIFI_SERVICE);
if(!wifi.isWifiEnabled()){
wifi.setWifiEnabled(true);
}
startScan();
}
#Override
public void onStop(){
super.onStop();
finish();
}
public void startScan(){
testDate=new Date();
wifi.startScan();
}
}
you_image_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(this, wifiScan.class);
getApplicationContext().startActivity(i);
}
});
I'm trying to use Andrioid's preferences system in conjunction with LibGDX's preferences system. They both use SharedPreferences as a backend, so I figure they should be able to work together, but when I try to load the data in LibGDX's preferences, I don't get any data back.
My Android preferences.xml file (I know it's short, it'll have much more later :P):
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<EditTextPreference
android:key="framerate"
android:title="Set Framerate"
android:enabled="true"
android:persistent="true"
android:defaultValue="25" />
</PreferenceScreen>
Here is my PreferenceActivity:
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
public class WallpaperSettings extends PreferenceActivity {
#SuppressLint("NewApi")
#SuppressWarnings("deprecation")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT < 11) {
addPreferencesFromResource(R.xml.preferences);
} else {
getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
}
}
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class MyPreferenceFragment extends PreferenceFragment
{
#Override
public void onCreate(final Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
}
When I call it from a subclass of com.badlogic.gdx.Game, I use
Preferences pref = Gdx.app.getPreferences("preferences");
pref.getInteger("framerate");
The number of keys within pref is 0.
Anyone have a clue as to how this might be fixed?
Thanks to http://www.badlogicgames.com/forum/viewtopic.php?f=11&t=6365#p32981 I was able to solve the problem.
Just a note, the code works for both Android 2.x and 3.0+.
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
public class WallpaperSettings extends PreferenceActivity {
#SuppressLint("NewApi")
#SuppressWarnings("deprecation")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT < 11) {
addPreferencesFromResource(R.xml.preferences);
} else {
getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
}
}
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class MyPreferenceFragment extends PreferenceFragment
{
#Override
public void onCreate(final Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
getPreferenceManager().setSharedPreferencesName("preferences");
getPreferenceManager().setSharedPreferencesMode(0);
}
}
}
I'm trying to change between activities in my Android app (2.1-update1), but it doesn't work.
Any suggestions?
The only thing that happens when I debug the app is that it stops on this part of the code in Instrumentation.java:
public void waitForIdle() {
synchronized (this) {
while (!mIdle) {
try {
wait();
} catch (InterruptedException e) {
}
}
}
}
Eclipse says that it is in Thread 1 on
Instrumentation.checkStartActivityResult(int, Object) line: 1537. If I
resume the app, the next stop is in ZygoteInit.java trying to run
Throwable cause = ex.getCause(); ... Eclipse says
ZygoteInit$MethodAndArgsCaller.run() line: 864.
Here is the source code:
HappyHomes.java
package com.example.app;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class HappyHomes extends Activity {
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button login = (Button) findViewById(R.id.btnLogin);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ProgressDialog laddRuta = ProgressDialog.show(HappyHomes.this, "",
"Loggar in, vänligen vänta...", true);
Intent myIntent = new Intent(view.getContext(), Kategorier.class);
myIntent.
startActivity(myIntent);
}
});
}
}
Kategorier.java
package com.example.app;
import android.app.Activity;
import android.os.Bundle;
public class Kategorier extends Activity {
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.kategorier);
}
}
Thanks for helping!
Make sure that Kategorier is registered in your AndroidManifest.xml file.
Change myIntent.startActivity(myIntent); to HappyHomes.this.startActivity(myIntent);
There is no any startActivity() method in Intent class . you must be doing wrong.
just write startActivity(myIntent)
All the Services, Broadcast Receivers and Activites must be declared in manifest file.