我一直在尝试制作一个 Android 小部件，它只是一个具有用户定义颜色的 TextClock。但是，在启动器重新启动后，TextClock 的颜色总是恢复为白色，并且不保留用户定义的颜色。这是我第一次制作 Android 小部件，几天来我一直在努力弄清楚为什么会这样。
所以，
配置活动：
public class MainActivity extends Activity {
int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setResult(RESULT_CANCELED);
setContentView(R.layout.main_activity);
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
mAppWidgetId = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
// If they gave us an intent without the widget id, just bail.
if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
finish();
}
OnCancelListener cancelListener = new OnCancelListener()
{
@Override
public void onCancel(DialogInterface dialog)
{
MainActivity.this.finish();
}
};
OnColorChangedListener ccListener = new ColorPickerDialog.OnColorChangedListener(){
@Override
public void onColorChanged(int color) {
PreferenceManager.getDefaultSharedPreferences(MainActivity.this).edit().putInt("color", color).apply();
getSharedPreferences("" + mAppWidgetId, MODE_PRIVATE).edit().putInt("color", color).apply();
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(MainActivity.this);
MyWidget.updateAppWidget(MainActivity.this, appWidgetManager, mAppWidgetId, color);
Intent resultValue = new Intent();
resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
setResult(RESULT_OK, resultValue);
finish();
}
};
int initialColor = PreferenceManager.getDefaultSharedPreferences(this).getInt("color", Color.RED);
ColorPickerDialog cpd = new ColorPickerDialog(this, initialColor);
cpd.setHexValueEnabled(true);
cpd.setAlphaSliderVisible(true);
cpd.setOnColorChangedListener(ccListener);
cpd.setOnCancelListener(cancelListener);
cpd.show();
}
}
AppWidgetProvider：
public class MyWidget extends AppWidgetProvider{
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
Log.d("Hey", "onUpdate");
final int N = appWidgetIds.length;
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
int color = context.getSharedPreferences("" + appWidgetId, Context.MODE_PRIVATE).getInt("color", Color.RED);
updateAppWidget(context, appWidgetManager, appWidgetId, color);
}
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
// When the user deletes the widget, delete the preference associated with it.
final int N = appWidgetIds.length;
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
context.getSharedPreferences("" + appWidgetId, Context.MODE_PRIVATE).edit().clear().apply();
}
}
@Override
public void onAppWidgetOptionsChanged (Context context, AppWidgetManager appWidgetManager, int appWidgetId, Bundle newOptions){
super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId, newOptions);
Log.d("updating", "updating");
int nwidth = newOptions.getInt(AppWidgetManager.OPTION_APPWIDGET_MAX_WIDTH) - newOptions.getInt(AppWidgetManager.OPTION_APPWIDGET_MIN_WIDTH);
int nheight = newOptions.getInt(AppWidgetManager.OPTION_APPWIDGET_MAX_HEIGHT) - newOptions.getInt(AppWidgetManager.OPTION_APPWIDGET_MIN_HEIGHT);
Log.d("nheight", "" + nheight);
Log.d("nwidth", "" + nwidth);
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.activity_main);
PackageManager packageManager = context.getPackageManager();
Intent alarmClockIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);
// Verify clock implementation
String clockImpls[][] = {
{"HTC Alarm Clock", "com.htc.android.worldclock", "com.htc.android.worldclock.WorldClockTabControl" },
{"Standard Alarm Clock", "com.android.deskclock", "com.android.deskclock.AlarmClock"},
{"Froyo Nexus Alarm Clock", "com.google.android.deskclock", "com.android.deskclock.DeskClock"},
{"Moto Blur Alarm Clock", "com.motorola.blur.alarmclock", "com.motorola.blur.alarmclock.AlarmClock"},
{"Samsung Galaxy Clock", "com.sec.android.app.clockpackage","com.sec.android.app.clockpackage.ClockPackage"}
};
boolean foundClockImpl = false;
for(int i=0; i<clockImpls.length; i++) {
String vendor = clockImpls[i][0];
String packageName = clockImpls[i][1];
String className = clockImpls[i][2];
try {
ComponentName cn = new ComponentName(packageName, className);
ActivityInfo aInfo = packageManager.getActivityInfo(cn, PackageManager.GET_META_DATA);
alarmClockIntent.setComponent(cn);
Log.d("Clock", "Found " + vendor + " --> " + packageName + "/" + className + ".");
foundClockImpl = true;
} catch (NameNotFoundException e) {
Log.d("Clock", vendor + " does not exists.");
}
}
if (foundClockImpl) {
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, alarmClockIntent, 0);
// add pending intent to your component
// ....
views.setOnClickPendingIntent(R.id.textClock, pendingIntent);
}
if (nwidth >= 60 || nwidth==0){
views.setTextViewTextSize(R.id.textClock, TypedValue.COMPLEX_UNIT_SP, 48);
} else if(nwidth >= 40){
views.setTextViewTextSize(R.id.textClock, TypedValue.COMPLEX_UNIT_SP, 26);
} else{
views.setTextViewTextSize(R.id.textClock, TypedValue.COMPLEX_UNIT_SP, 12);
}
appWidgetManager.updateAppWidget(appWidgetId, views);
}
static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
int appWidgetId, int color) {
// Construct the RemoteViews object. It takes the package name (in our case, it's our
// package, but it needs this because on the other side it's the widget host inflating
// the layout from our package).
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.activity_main);
views.setTextColor(R.id.textClock, color);
// Tell the widget manager
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
activity_main.xml（小部件的布局）：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_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" >
<TextClock
android:id="@+id/textClock"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="26sp"
/>
</RelativeLayout>
appwidget_info.xml：
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="80dp"
android:minHeight="40dp"
android:minResizeWidth="20dp"
android:minResizeHeight="20dp"
android:updatePeriodMillis="0"
android:previewImage="@drawable/ic_launcher"
android:initialLayout="@layout/activity_main"
android:configure="com.brianco.colorclock.MainActivity"
android:resizeMode="horizontal|vertical"
android:widgetCategory="home_screen|keyguard"
android:initialKeyguardLayout="@layout/activity_main">
</appwidget-provider>
...在 AndroidManifest.xml 中：
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name="com.brianco.colorclock.MainActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Translucent.NoTitleBar" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
</intent-filter>
</activity>
<receiver android:name="com.brianco.colorclock.MyWidget" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/appwidget_info" />
</receiver>
</application>
任何深入了解配置活动中的设置为什么没有“坚持”的任何见解都将不胜感激。如果我解决了这个问题，我希望开源这个应用程序，以便其他人可以学习。