Android编程之桌面小部件AppWidgetProvider用法示例

本文实例讲述了Android编程之桌面小部件AppWidgetProvider用法。分享给大家供大家参考，具体如下：

public class ExampleAppWidgetConfigure extends Activity {
  static final String TAG = "ExampleAppWidgetConfigure";
  // 保存的文件名
  private static final String PREFS_NAME = "com.example.android.apis.appwidget.ExampleAppWidgetProvider";
  // 保存的字段KEY
  private static final String PREF_PREFIX_KEY = "prefix_";
  // 小部件 对应ID
  int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
  // 输入框
  EditText mAppWidgetPrefix;
  public ExampleAppWidgetConfigure() {
    super();
  }
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setResult(RESULT_CANCELED);
    // 设置布局
    setContentView(R.layout.appwidget_configure);
    mAppWidgetPrefix = (EditText) findViewById(R.id.appwidget_prefix);
    // 设置监听
    findViewById(R.id.save_button).setonClickListener(mOnClickListener);
    // 获取intent传递过来的数据
    Intent intent = getIntent();
    Bundle extras = intent.getExtras();
    if (extras != null) {
      mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID,
   AppWidgetManager.INVALID_APPWIDGET_ID);
    }
    if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
      finish();
    }
    mAppWidgetPrefix.setText(loadTitlePref(ExampleAppWidgetConfigure.this,
 mAppWidgetId));
  }
  View.onClickListener monClickListener = new View.onClickListener() {
    public void onClick(View v) {
      final Context context = ExampleAppWidgetConfigure.this;
      String titlePrefix = mAppWidgetPrefix.getText().toString();
      //保存到SharedPreferences文件
      saveTitlePref(context, mAppWidgetId, titlePrefix);
      AppWidgetManager appWidgetManager = AppWidgetManager
   .getInstance(context);
      //更新小部件
      ExampleAppWidgetProvider.updateAppWidget(context, appWidgetManager,
   mAppWidgetId, titlePrefix);
      Intent resultValue = new Intent();
      resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
   mAppWidgetId);
      setResult(RESULT_OK, resultValue);
      finish();
    }
  };
  static void saveTitlePref(Context context, int appWidgetId, String text) {
    SharedPreferences.Editor prefs = context.getSharedPreferences(
 PREFS_NAME, 0).edit();
    prefs.putString(PREF_PREFIX_KEY + appWidgetId, text);
    prefs.commit();
  }
  static String loadTitlePref(Context context, int appWidgetId) {
    SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
    String prefix = prefs.getString(PREF_PREFIX_KEY + appWidgetId, null);
    if (prefix != null) {
      return prefix;
    } else {
      return context.getString(R.string.appwidget_prefix_default);
    }
  }
  static void deleteTitlePref(Context context, int appWidgetId) {
  }
  static void loadAllTitlePrefs(Context context,
      ArrayList appWidgetIds, ArrayList texts) {
  }
}

public class ExampleAppWidgetProvider extends AppWidgetProvider {
  // Log打印日志标签
  private static final String TAG = "ExampleAppWidgetProvider";
  
  @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
      int[] appWidgetIds) {
    Log.d(TAG, "onUpdate");
    final int N = appWidgetIds.length;
    for (int i = 0; i < N; i++) {
      //获取到id
      int appWidgetId = appWidgetIds[i];
      //设置标题
      String titlePrefix = ExampleAppWidgetConfigure.loadTitlePref(
   context, appWidgetId);
      //更新AppWidget
      updateAppWidget(context, appWidgetManager, appWidgetId, titlePrefix);
    }
  }
  
  @Override
  public void onDeleted(Context context, int[] appWidgetIds) {
    Log.d(TAG, "onDeleted");
    final int N = appWidgetIds.length;
    for (int i = 0; i < N; i++) {
      ExampleAppWidgetConfigure.deleteTitlePref(context, appWidgetIds[i]);
    }
  }
  
  @Override
  public void onEnabled(Context context) {
    Log.d(TAG, "onEnabled");
    PackageManager pm = context.getPackageManager();
    pm.setComponentEnabledSetting(new ComponentName(
 "com.example.android.apis",
 ".appwidget.ExampleBroadcastReceiver"),
 PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
 PackageManager.DONT_KILL_APP);
  }
  
  @Override
  public void onDisabled(Context context) {
    Log.d(TAG, "onDisabled");
    PackageManager pm = context.getPackageManager();
    //设置组件可用
    pm.setComponentEnabledSetting(new ComponentName(
 "com.example.android.apis",
 ".appwidget.ExampleBroadcastReceiver"),
 PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
 PackageManager.DONT_KILL_APP);
  }
  static void updateAppWidget(Context context,
      AppWidgetManager appWidgetManager, int appWidgetId,
      String titlePrefix) {
    Log.d(TAG, "updateAppWidget appWidgetId=" + appWidgetId
 + " titlePrefix=" + titlePrefix);
    CharSequence text = context.getString(R.string.appwidget_text_format,
 ExampleAppWidgetConfigure.loadTitlePref(context, appWidgetId),
 "0x" + Long.toHexString(SystemClock.elapsedRealtime()));
    // 创建RemoteViews 对象
    RemoteViews views = new RemoteViews(context.getPackageName(),
 R.layout.appwidget_provider);
    // 设置RemoteViews 对象的文本
    views.setTextViewText(R.id.appwidget_text, text);
    // 告诉AppWidgetManager 显示 views对象给widget.
    appWidgetManager.updateAppWidget(appWidgetId, views);
  }
}

小部件布局

public class ExampleBroadcastReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
    Log.d("ExmampleBroadcastReceiver", "intent=" + intent);
    //获取广播的ACTION
    String action = intent.getAction();
    //对ACTION进行判断
    if (action.equals(Intent.ACTION_TIMEZONE_CHANGED)
 || action.equals(Intent.ACTION_TIME_CHANGED)) {
      AppWidgetManager gm = AppWidgetManager.getInstance(context);
      ArrayList appWidgetIds = new ArrayList();
      ArrayList texts = new ArrayList();
      ExampleAppWidgetConfigure.loadAllTitlePrefs(context, appWidgetIds, texts);
      final int N = appWidgetIds.size();
      for (int i=0; i

在AndroidManifest.xml中添加相应组件：
ExampleAppWidgetConfigure


  
    
  




ExampleAppWidgetProvider


  
  
    
  




ExampleBroadcastReceiver

 
  
    
    
  




开源代码：https://github.com/ldm520/ANDROID_API_DEMOS
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