Widget窗口小部件

查看文档中app components--->App Widget

1.编写一个类继承AppWidgetProvider

这里开启了服务，如果服务没写，就会在创建窗口小部件时报错，可以把开启，关闭服务的功能屏蔽（这里没有屏蔽），要不会报错

package com.example.mobilesafe.provider;

import java.security.Provider;
import java.util.Timer;
import java.util.TimerTask;

import com.example.mobilesafe.service.updateWeightViewService;

import android.annotation.SuppressLint;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.format.Time;

public class MyAppWidgetProvider extends AppWidgetProvider {
	@Override
	public void onEnabled(Context context) {
		context.startService(new Intent(context, updateWeightViewService.class));
		super.onEnabled(context);
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		context.startService(new Intent(context, updateWeightViewService.class));
		super.onReceive(context, intent);
	}

	@SuppressLint("NewApi")
	@Override
	public void onAppWidgetOptionsChanged(Context context,
			AppWidgetManager appWidgetManager, int appWidgetId,
			Bundle newOptions) {
		// TODO Auto-generated method stub
		super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId,
				newOptions);
	}

	@Override
	public void onDisabled(Context context) {
		context.stopService(new Intent(context, updateWeightViewService.class));
		super.onDisabled(context);
	}
}

2.在清单文件里配置这个类

 <receiver android:name="com.example.mobilesafe.provider.MyAppWidgetProvider" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

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

<receiver android:name="com.example.mobilesafe.provider.MyAppWidgetProvider" >是类名

android:resource="@xml/my_appwidget_info" />是一个配置文件

3.配置文件

在xml下创建一个配置文件，名字叫my_appwidget_info

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/process_widget"
    android:minHeight="72.0dip"
    android:minWidth="294.0dip"
    android:updatePeriodMillis="0" />

android:initialLayout="@layout/process_widget"是布局文件

4.布局文件

就是普通的布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/ll_Weight"
    android:background="@drawable/widget_bg_portrait"
    android:gravity="center_vertical" >

    <LinearLayout
        android:layout_width="0.0dip"
        android:layout_height="fill_parent"
        android:layout_marginLeft="5.0dip"
        android:layout_weight="1.0"
        android:background="@drawable/widget_bg_portrait_child"
        android:gravity="center_vertical"
        android:orientation="vertical"
        android:paddingBottom="3.0dip"
        android:paddingTop="3.0dip" >

        <TextView
            android:id="@+id/tv_processCount"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10.0dip" />

        <ImageView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="1.0dip"
            android:layout_marginTop="1.0dip"
            android:background="@drawable/widget_bg_portrait_child_divider" />

        <TextView
            android:id="@+id/tv_processSpace"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10.0dip" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_vertical" >

            <ImageView
                android:layout_width="20.0dip"
                android:layout_height="20.0dip"
                android:src="@drawable/ic_launcher" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/app_name"
                android:textColor="#fff" />
        </LinearLayout>

        <Button
            android:id="@+id/bt_clear"
            android:layout_width="90.0dip"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginTop="5.0dip"
            android:background="@drawable/restart_bg"
            android:text="一键清理"
            android:textColor="#000" />
    </LinearLayout>

</LinearLayout>

5到这里显示工作就完成了一大部分，但是这个窗口小部件不能显示数据，点击也没有响应（因为第一步那个服务还没写），甚至会报错，下面就是通过第一步那个没有实现的服务实现所有功能

6.服务

package com.example.mobilesafe.service;

import java.util.Timer;
import java.util.TimerTask;

import com.example.mobilesafe.R;
import com.example.mobilesafe.engine.AppProcessEngine;

import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.text.format.Formatter;
import android.util.Log;
import android.widget.RemoteViews;

public class updateWeightViewService extends Service {

	private myReceiver myReceiver;
	private TimerTask timerTask;
	private Timer timer;

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void onCreate() {
		IntentFilter intentFilter = new IntentFilter();
		intentFilter.addAction(Intent.ACTION_SCREEN_ON);
		myReceiver = new myReceiver();
		registerReceiver(myReceiver, intentFilter);
		startUpdate();
		super.onCreate();
	}

	/**
	 * 开启任务
	 */
	private void startUpdate() {
		timer = new Timer();
		timerTask = new TimerTask() {

			@Override
			public void run() {
				updateWeight();
			}

		};
		timer.schedule(timerTask, 0, 5000);
	}

	/**
	 * 更新控件
	 */
	private void updateWeight() {
		AppWidgetManager aWM = AppWidgetManager
				.getInstance(getApplicationContext());
		RemoteViews views = new RemoteViews(getPackageName(),
				R.layout.process_widget);
		// 设置文本更新1
		views.setTextViewText(
				R.id.tv_processCount,
				"进程数:"
						+ AppProcessEngine
								.getProcessCount(getApplicationContext()));
		// 设置文本更新2
		views.setTextViewText(
				R.id.tv_processSpace,
				"内存:"
						+ Formatter
								.formatFileSize(
										getApplicationContext(),
										AppProcessEngine
												.getAvlibeProcessSpace(getApplicationContext())));

		// 点击打开应用
		Intent intent = new Intent("android.intent.action.HOME");
		intent.addCategory("android.intent.category.DEFAULT");
		PendingIntent pendingIntent = PendingIntent.getActivity(
				getApplicationContext(), 0, intent,
				PendingIntent.FLAG_UPDATE_CURRENT);
		views.setOnClickPendingIntent(R.id.ll_Weight, pendingIntent);
		// 点击清理内存
		Intent intent2 = new Intent(
				"android.intent.action.KILL_BACKGROUND_PROCESS");

		PendingIntent pendingIntent2 = PendingIntent.getBroadcast(this, 0,
				intent2, PendingIntent.FLAG_UPDATE_CURRENT);
		views.setOnClickPendingIntent(R.id.bt_clear, pendingIntent2);
		// 得到componentName
		ComponentName componentName = new ComponentName(
				getApplicationContext(),
				"com.example.mobilesafe.provider.MyAppWidgetProvider");
		aWM.updateAppWidget(componentName, views);
	}

	/**
	 * 停止任务
	 */
	private void stopUpdate() {
		if (timer != null) {
			timer.cancel();
		}
	}

	private class myReceiver extends BroadcastReceiver {
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (Intent.ACTION_SCREEN_ON.equals(intent.getAction())) {
				startUpdate();
			} else {
				stopUpdate();
			}
		}
	}

	@Override
	public void onDestroy() {
		if (myReceiver != null) {
			unregisterReceiver(myReceiver);
		}
		stopUpdate();
		super.onDestroy();
	}
}

这里还有那个点击按钮，开启广播功能的那个广播没写，这里就不写了

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