当用作窗口小部件的布局背景时,ClipDrawable不起作用

时间:2013-04-09 02:26:43

标签: java android android-widget android-linearlayout

我正在尝试制作一个简单的小部件,在小部件中以文本和图形方式显示电池百分比。文本部分没有问题,但是我很难让窗口小部件以图形方式更新。

从图形上看,我有一个电池图像,我根据电池百分比剪辑。我正在尝试使用ClipDrawable

battery_widget_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/widgetLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:padding="@dimen/widget_padding"
    android:background="@drawable/battery_clip_layer" >

    <TextView
        android:id="@+id/batteryPercentageWidgetTextView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/battery_percentage_widget_default"
        android:gravity="center" />

</LinearLayout>

battery_clip_layer.xml(即ClipDrawable)

<clip xmlns:android="http://schemas.android.com/apk/res/android"
    android:clipOrientation="vertical"
    android:gravity="bottom"
    android:drawable="@drawable/battery_shape" />

BatteryService.java - 通过RemoteViews接收电池事件并更新小部件的服务

public class BatteryService extends Service {

    private static final String LOG = BatteryService.class.getName();
    private final AtomicInteger batteryPercentage = new AtomicInteger(100);

    private final BroadcastReceiver batteryUpdateReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            int level = intent.getIntExtra("level", 0);
            batteryPercentage.set(level);
            updateWidget();
        }
    };


    @Override
    public void onCreate() {
        super.onCreate();
        registerReceiver(batteryUpdateReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        Log.i(LOG, "Created...");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        unregisterReceiver(batteryUpdateReceiver);
        Log.i(LOG, "Destroyed...");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(LOG, "Started...");
        updateWidget();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    private void updateWidget() {
        final int percentage = batteryPercentage.get();
        log.i(LOG, "Updated... " + percentage);
        RemoteViews remoteViews = new RemoteViews(getPackageName(),  R.layout.battery_widget_layout);
        remoteViews.setTextViewText(R.id.batteryPercentageWidgetTextView, percentage + "%");
        //ATTEMPT 1 - no cigar
        remoteViews.setInt(R.drawable.battery_clip_layer, "setLevel", 5000);
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        appWidgetManager.updateAppWidget(new ComponentName(this, BatteryAppWidgetProvider.class), remoteViews);
    }

    private void updateWidgetAttempt2() {
        final int percentage = batteryPercentage.get();
        Log.i(LOG, "Updated... " + percentage);
        //ATTEMPT 2 - still no cigar
        Drawable clipLayer = getApplicationContext().getResources().getDrawable(R.drawable.battery_clip_layer);
        if (clipLayer instanceof ClipDrawable) {
            ClipDrawable clipDrawable = (ClipDrawable) clipLayer;
            int level = clipDrawable.getLevel();
            if (clipDrawable.setLevel(10000)) {
                clipDrawable.invalidateSelf();
            }
            Log.i(LOG, "Updated clip amount..." + level + " -> " + ((ClipDrawable) clipLayer).getLevel());
        }
        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.battery_widget_layout);
        remoteViews.setTextViewText(R.id.batteryPercentageWidgetTextView, percentage + "%");
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        appWidgetManager.updateAppWidget(new ComponentName(this, BatteryAppWidgetProvider.class), remoteViews);
    }

}

BatteryService中,请查看更新窗口小部件的两种不同尝试(updateWidget()updateWidgetAttempt2())。这两种尝试都没有成功。

我觉得我在做一些根本错误的事情。我非常感谢任何帮助/建议! :)

2 个答案:

答案 0 :(得分:4)

你是正确的,因为你需要在Drawable实例上设置关卡,但不幸的是你无法进入Drawable,因为它在远程视图中。

但是,ImageView确实有一个名为setImageLevel的方法,您可以远程调用它。我的建议是将Drawable放在ImageView而不是容器的背景中,然后使用setInt(R.id.image_view, "setImageLevel", level)

以下是布局的样子:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/widgetLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="@dimen/widget_padding" >

    <ImageView
        android:id="@+id/battery"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/battery_clip_layer" />

    <TextView
        android:id="@+id/batteryPercentageWidgetTextView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/battery_percentage_widget_default"
        android:gravity="center" />

</FrameLayout>

updateWidget()方法:

private void updateWidget() {
    final int percentage = batteryPercentage.get();
    log.i(LOG, "Updated... " + percentage);

    RemoteViews remoteViews = new RemoteViews(getPackageName(),  R.layout.battery_widget_layout);
    remoteViews.setTextViewText(R.id.batteryPercentageWidgetTextView, percentage + "%");

    remoteViews.setInt(R.id.battery, "setImageLevel", percentage * 100);

    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
    appWidgetManager.updateAppWidget(new ComponentName(this, BatteryAppWidgetProvider.class), remoteViews);
}

答案 1 :(得分:0)

您在窗口小部件中使用ClipDrawable的两次尝试都不正确。在第一次尝试中,您错误地使用了setInt()方法,因为该方法希望第一个int参数是小工具布局中id的{​​{1}}(而不是可绘制的)像你尝试的那样参考),Android SDK的任何View子类上都没有setLevel()方法,该方法存在于View类中。你的第二种方法也是不正确的,因为你所做的就是加载一个Drawable,设置它的级别,就是这一切,新创建的Drawable与小部件的Drawable根无关。

要使LinearLayout工作,您需要将其级别设置为所需的值,同时drawable已设置为ClipDrawable的背景,或者您可以将其设置为的背景。不幸的是,当在窗口小部件中使用布局时,我不知道如何做到这一点。

您需要使用解决方法(Jschools提供一个)。