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POcustom ColorDialogPreference - saving/retrieving as sharedpreference
 

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  1. POcustom ColorDialogPreference - saving/retrieving as sharedpreference
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    <p>I'm having trouble implementing this <a href="http://www.cmwmobile.com/index.php?option=com_content&amp;view=article&amp;id=34%3ahow-to-create-a-colordialogpreference&amp;catid=10%3ablog&amp;Itemid=43" rel="nofollow">color picker</a> into my live wallpaper. It works just fine out of the box by itself (I can add it to my preferences menu, open up the widget and select a color), however I want to use that selected color to detail an EditText field that the user will see on the homescreen canvas. I can easily achieve this by changing <code>ColorDialogPreference.java's</code> <code>int color</code> to a static variable and calling it from the WallpaperService class directly:</p> <p><code>int mColor = com.my.app.ColorDialogPreference.color;</code></p> <p>But since it's static, the color gets reset once the process gets destroyed.</p> <p>I've tried saving the variable via a SharedPreferences Editor inside my PreferencesActivity.java (see below), but can't seem to retrieve that variable in the WallpaperService class.</p> <p><strong>PreferencesActivity.java:</strong></p> <pre><code>package com.my.app; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceActivity; import android.preference.PreferenceManager; public class MyPreferencesActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener { @SuppressWarnings("deprecation") @Override protected void onCreate (Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharedPreferences preferences = getSharedPreferences("prefs", MODE_WORLD_WRITEABLE); getPreferenceManager().setSharedPreferencesName("preferenceKeyName"); SharedPreferences.Editor editor = preferences.edit(); editor.putInt("preferenceKeyName", Color.GRAY); editor.commit(); getPreferenceManager().setSharedPreferencesName("text_to_display"); getPreferenceManager().getSharedPreferences(). registerOnSharedPreferenceChangeListener(this); addPreferencesFromResource(R.xml.prefs); } @SuppressWarnings("deprecation") protected void onDestroy() { getPreferenceManager().getSharedPreferences(). unregisterOnSharedPreferenceChangeListener(this); super.onDestroy(); } @SuppressWarnings("deprecation") protected void onResume() { super.onResume(); getPreferenceManager().getSharedPreferences(). registerOnSharedPreferenceChangeListener(this); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { getPreferenceManager().getSharedPreferences(). registerOnSharedPreferenceChangeListener(this); } } </code></pre> <p><strong>WallpaperService.java:</strong></p> <pre><code>package com.my.app; import java.util.List; import java.util.Random; import android.content.Context; import android.content.SharedPreferences; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Handler; import android.preference.PreferenceManager; import android.service.wallpaper.WallpaperService; import android.view.SurfaceHolder; public class MyWallpaperService extends WallpaperService { public MyWallpaperService() { super(); } @Override public Engine onCreateEngine() { return new MyWallpaperEngine(); } public class MyWallpaperEngine extends Engine implements OnSharedPreferenceChangeListener { Context ctx = getApplicationContext(); SharedPreferences sharedPreferences2 = getSharedPreferences("prefs", MODE_WORLD_READABLE); private int mColor = sharedPreferences2.getInt("preferenceKeyName", Color.RED); private boolean mVisible = false; Paint p = new Paint(); float x1 = 0; float y1 = 60; private final Handler mHandler = new Handler(); private final Runnable mUpdateDisplay = new Runnable() { @Override public void run() { draw(); }}; private void draw() { SurfaceHolder holder = getSurfaceHolder(); Canvas c = null; try { c = holder.lockCanvas(); if (c != null) { String text = "1. " + mText; c.drawRect(0, 0, c.getWidth(), c.getHeight(), p); p.setColor(mColor); c.drawText(text, x, y, p); } } } } finally { if (c != null) holder.unlockCanvasAndPost(c); } mHandler.removeCallbacks(mUpdateDisplay); if (mVisible) { mHandler.postDelayed(mUpdateDisplay, 16); } } private final Handler handler = new Handler(); private final Runnable drawRunner = new Runnable() { @Override public void run() { draw(); } }; @Override public void onVisibilityChanged(boolean visible) { super.onVisibilityChanged(visible); mVisible = visible; if (visible) { mText = sharedPreferences.getString("text_to_display", "default"); draw(); } else { mHandler.removeCallbacks(mUpdateDisplay); } } @Override public void onSurfaceDestroyed(SurfaceHolder holder) { super.onSurfaceDestroyed(holder); mVisible = false; handler.removeCallbacks(drawRunner); mHandler.removeCallbacks(mUpdateDisplay); } @Override public void onDestroy() { super.onDestroy(); mVisible = false; mHandler.removeCallbacks(mUpdateDisplay); } @Override public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { draw(); } } @Override public void onSharedPreferenceChanged( SharedPreferences sharedPreferences, String key) { // TODO Auto-generated method stub } } } </code></pre> <p>And my <strong>prefs.xml:</strong></p> <pre><code>`&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;PreferenceScreen android:title="Set Text" android:summary="Some summary" &gt; &lt;EditTextPreference android:key="text_to_display" android:title="Some text" /&gt; &lt;/PreferenceScreen&gt; &lt;PreferenceScreen android:title="Colors" android:summary="Any color you want!" &gt; &lt;com.my.app.ColorPickerPreference android:defaultValue="0xffffffff" android:key="preferenceKeyName" android:title="@string/pref_name" android:summary="@string/pref_summary" /&gt; &lt;/PreferenceScreen&gt; &lt;/PreferenceScreen&gt;` </code></pre> <p>If I display the value of <code>int color</code> on the canvas, all that ever comes up is "-65535". I know that <code>PreferencesActivity</code> works to some degree, because retrieving <code>"text_to_display"</code>, which is an EditText value, works just fine. Something else that is worth noting: if the process gets killed at all (reboot phone or FC), the color that I selected in the widget stays that color if I go back to the widget after having the process killed, so it seems to be saving inside <code>ColorDialogPreference.java</code>, but nowhere else?</p>
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