《Android 开发艺术探索》 05-理解RemoteViews

    /**
     * 打开自定义布局的通知栏
     */
    private void displayRemoteViews() {
        Notification notification = new Notification();
        notification.icon = R.mipmap.ic_launcher;
        notification.tickerText = "我是小部件";
        notification.when = System.currentTimeMillis();
        notification.flags = Notification.FLAG_AUTO_CANCEL;
        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
        PendingIntent pedingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.layout_notification);
        remoteViews.setTextViewText(R.id.tv_msg, "我是文字信息");
        remoteViews.setImageViewResource(R.id.iv_icon, R.mipmap.favicon);

        notification.contentView = remoteViews;
        notification.contentIntent = pedingIntent;

        PendingIntent openActivity2PendingIntent = PendingIntent.getActivity(this,
                0, new Intent(this, OpenActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.tv_open, openActivity2PendingIntent);


        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(2, notification);
    }

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/layout_widget"
    android:minHeight="100dp"
    android:minWidth="100dp"
    android:updatePeriodMillis="60000"
    >
</appwidget-provider>

/**
 * Created by suzeyu on 16/8/11.
 * 定义小部件的实现类
 */
public class MyAppWidgetProvider extends AppWidgetProvider {
    public static final String TAG = MyAppWidgetProvider.class.getName();
    public static final String CLICK_ACTION = "com.szysky.note.androiddevseek_05.action.CLICK";

    @Override
    public void onReceive(final Context context, Intent intent) {
        super.onReceive(context, intent);
        Log.i(TAG, "onReceive: 接收到广播-->"+intent.getAction());

        //是触发的自己点击时发送的action那么就让小部件旋转
        if (intent.getAction().equals(CLICK_ACTION)){
            Toast.makeText(context, "准备旋转", Toast.LENGTH_SHORT).show();

            AsyncTask.execute(new Runnable() {
                @Override
                public void run() {
                    Bitmap srcBmp = BitmapFactory.decodeResource(context.getResources(), R.mipmap.favicon);
                    AppWidgetManager widgetManager = AppWidgetManager.getInstance(context);

                    for (int i = 0; i < 37; i++) {
                        float degree = (i * 10) % 360;
                        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);
                        remoteViews.setImageViewBitmap(R.id.iv_main, rotateBmp(context, srcBmp, degree));

                        if (i==36){
                            Intent intentClick = new Intent();
                            intentClick.setAction(CLICK_ACTION);
                            PendingIntent peddingIntent = PendingIntent.getBroadcast(context, 0, intentClick, 0);
                            remoteViews.setOnClickPendingIntent(R.id.iv_main, peddingIntent);
                        }


                        widgetManager.updateAppWidget(new ComponentName(context, MyAppWidgetProvider.class), remoteViews);
                        SystemClock.sleep(50);
                    }
                }
            });


        }
    }



    /**
     * 旋转一个bitmap
     */
    private Bitmap rotateBmp(Context context, Bitmap srcBmp, float degree) {
        Matrix matrix = new Matrix();
        matrix.reset();
        matrix.setRotate(degree);
        return Bitmap.createBitmap(srcBmp, 0, 0, srcBmp.getWidth(), srcBmp.getHeight(), matrix, true);
    }

    /**
     * 当自定义的小桌面被添加 这个方法只有在本实例中只有被添加的时候才调用
     */
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);

        final int counter = appWidgetIds.length;
        Log.i(TAG, "小桌面更新了   counter="+counter);

        for (int i = 0; i < counter; i++) {
            int appWidgetID = appWidgetIds[i];
            onWidgetUpdate(context, appWidgetManager, appWidgetID);
        }
    }

    /**
     * 桌面小部件更新  这个方法只有在本实例中只有被添加的时候才调用
     */
    private void onWidgetUpdate(Context context, AppWidgetManager appWidgetManager, int appWidgetID) {
        Log.i(TAG, "onWidgetUpdate: id=="+appWidgetID);

        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.layout_widget);
        remoteViews.setImageViewBitmap(R.id.iv_main, BitmapFactory.decodeResource(context.getResources(), R.mipmap.favicon));


        Intent intentClick = new Intent();
        intentClick.setAction(CLICK_ACTION);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intentClick, 0);
        remoteViews.setOnClickPendingIntent(R.id.iv_main, pendingIntent);
        appWidgetManager.updateAppWidget(appWidgetID, remoteViews);
    }
}

<receiver android:name=".MyAppWidgetProvider">
            <meta-data android:name="android.appwidget.provider"
                        android:resource="@xml/widget_provider_info"/>

            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
                <action android:name="com.szysky.note.androiddevseek_05.action.CLICK"/>
            </intent-filter>
            
</receiver>

public void setTextViewText(int viewId, CharSequence text) {
   setCharSequence(viewId, "setText", text);
}

public void setCharSequence(int viewId, String methodName, CharSequence value) {
   addAction(new ReflectionAction(viewId, methodName, ReflectionAction.CHAR_SEQUENCE, value));
}

    private void addAction(Action a) {
        //省略部分代码...
        if (mActions == null) {
            mActions = new ArrayList<Action>();
        }
        mActions.add(a);

        // update the memory usage stats
        a.updateMemoryUsageEstimate(mMemoryUsageCounter);
    }

public View apply(Context context, ViewGroup parent, OnClickHandler handler) {
        RemoteViews rvToApply = getRemoteViewsToApply(context);

        View result;
        
        final Context contextForResources = getContextForResources(context);
        Context inflationContext = new ContextWrapper(context) {
            @Override
            public Resources getResources() {
                return contextForResources.getResources();
            }
            @Override
            public Resources.Theme getTheme() {
                return contextForResources.getTheme();
            }
            @Override
            public String getPackageName() {
                return contextForResources.getPackageName();
            }
        };

        LayoutInflater inflater = (LayoutInflater)
                context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // Clone inflater so we load resources from correct context and
        // we don't add a filter to the static version returned by getSystemService.
        inflater = inflater.cloneInContext(inflationContext);
        inflater.setFilter(this);
        result = inflater.inflate(rvToApply.getLayoutId(), parent, false);

        rvToApply.performApply(result, parent, handler);

        return result;
    }

 private void performApply(View v, ViewGroup parent, OnClickHandler handler) {
        if (mActions != null) {
            handler = handler == null ? DEFAULT_ON_CLICK_HANDLER : handler;
            final int count = mActions.size();
            for (int i = 0; i < count; i++) {
                Action a = mActions.get(i);
                a.apply(v, parent, handler);
            }
        }
    }

private final class ReflectionAction extends Action {
   //省略部分代码    ...
  

   String methodName;
   int type;
   Object value;

   ReflectionAction(int viewId, String methodName, int type, Object value) {
       this.viewId = viewId;
       this.methodName = methodName;
       this.type = type;
       this.value = value;
   }
   @Override
   public void apply(View root, ViewGroup rootParent, OnClickHandler handler) {
       final View view = root.findViewById(viewId);
       if (view == null) return;

       Class<?> param = getParameterType();
       if (param == null) {
           throw new ActionException("bad type: " + this.type);
       }

       try {
           getMethod(view, this.methodName, param).invoke(view, wrapArg(this.value));
       } catch (ActionException e) {
           throw e;
       } catch (Exception ex) {
           throw new ActionException(ex);
       }
   }
    // ...
}

private class TextViewSizeAction extends Action {
   public TextViewSizeAction(int viewId, int units, float size) {
       this.viewId = viewId;
       this.units = units;
       this.size = size;
   }
   
   @Override
   public void apply(View root, ViewGroup rootParent, OnClickHandler handler) {
       final TextView target = (TextView) root.findViewById(viewId);
       if (target == null) return;
       target.setTextSize(units, size);
   }

   public String getActionName() {
       return "TextViewSizeAction";
   }

   int units;
   float size;

   public final static int TAG = 13;
}