1.AndroidManifest.xml根据窗体小部件广播接受者关键字android.appwidget.action.APPWIDGET_UPDATE
搜索android:resource="@xml/process_widget_provider"
2.找到xml文件夹下process_widget_provider.xml
<appwidget-provider android:minWidth="294.0dip"
android:minHeight="72.0dip"
android:updatePeriodMillis="0"
android:initialLayout="@layout/process_widget"
xmlns:android="http://schemas.android.com/apk/res/android" />
3.initial Layout指向的布局文件process_widget
4.窗体小部件生命周期方法分析
1 public class MyAppWidgetProvider extends AppWidgetProvider {
2 private static final String tag = "MyAppWidgetProvider";
3 @Override
4 public void onReceive(Context context, Intent intent) {
5 Log.i(tag, "onReceive............");
6 super.onReceive(context, intent);
7 }
8 @Override
9 public void onEnabled(Context context) {
10 //创建第一个窗体小部件的方法
11 Log.i(tag, "onEnabled 创建第一个窗体小部件调用方法");
12 //开启服务(onCreate)
13 context.startService(new Intent(context, UpdateWidgetService.class));
14 super.onEnabled(context);
15 }
16 @Override
17 public void onUpdate(Context context, AppWidgetManager appWidgetManager,
18 int[] appWidgetIds) {
19 Log.i(tag, "onUpdate 创建多一个窗体小部件调用方法");
20 //开启服务
21 context.startService(new Intent(context, UpdateWidgetService.class));
22 super.onUpdate(context, appWidgetManager, appWidgetIds);
23 }
24 @Override
25 public void onAppWidgetOptionsChanged(Context context,
26 AppWidgetManager appWidgetManager, int appWidgetId,
27 Bundle newOptions) {
28 //当窗体小部件宽高发生改变的时候调用方法,创建小部件的时候,也调用此方法
29 //开启服务
30 context.startService(new Intent(context, UpdateWidgetService.class));
31 Log.i(tag, "onAppWidgetOptionsChanged 创建多一个窗体小部件调用方法");
32 super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId,
33 newOptions);
34 }
35
36 @Override
37 public void onDeleted(Context context, int[] appWidgetIds) {
38 Log.i(tag, "onDeleted 删除一个窗体小部件调用方法");
39 super.onDeleted(context, appWidgetIds);
40 }
41
42 @Override
43 public void onDisabled(Context context) {
44 Log.i(tag, "onDisabled 删除最后一个窗体小部件调用方法");
45 //关闭服务
46 context.stopService(new Intent(context, UpdateWidgetService.class));
47 super.onDisabled(context);
48 }
49 }
MyAppWidgetProvider
5.窗体小部件的更新进程总数和可用内存大小
1.将更新过程放置在服务中,服务什么时候开启?服务什么时候关闭?
2.一旦出现窗体小部件,则需要开启服务,所有窗体小部件销毁的时候,关闭服务
1 public class UpdateWidgetService extends Service {
2 protected static final String tag = "UpdateWidgetService";
3 private Timer mTimer;
4 private InnerReceiver mInnerReceiver;
5 @Override
6 public void onCreate() {
7 //管理进程总数和可用内存数更新(定时器)
8 startTimer();
9
10 //注册开锁,解锁广播接受者
11 IntentFilter intentFilter = new IntentFilter();
12 //开锁action
13 intentFilter.addAction(Intent.ACTION_SCREEN_ON);
14 //解锁action
15 intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
16
17 mInnerReceiver = new InnerReceiver();
18 registerReceiver(mInnerReceiver, intentFilter);
19
20 super.onCreate();
21 }
22
23 class InnerReceiver extends BroadcastReceiver{
24 @Override
25 public void onReceive(Context context, Intent intent) {
26 if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
27 //开启定时更新任务
28 startTimer();
29 }else{
30 //关闭定时更新任务
31 cancelTimerTask();
32 }
33 }
34 }
35
36 private void startTimer() {
37 mTimer = new Timer();
38 mTimer.scheduleAtFixedRate(new TimerTask() {
39 @Override
40 public void run() {
41 //ui定时刷新
42 updateAppWidget();
43 Log.i(tag, "5秒一次的定时任务现在正在运行..........");
44 }
45 }, 0, 5000);
46 }
47 public void cancelTimerTask() {
48 //mTimer中cancel方法取消定时任务方法
49 if(mTimer!=null){
50 mTimer.cancel();
51 mTimer = null;
52 }
53 }
54 protected void updateAppWidget() {
55 //1.获取AppWidget对象
56 AppWidgetManager aWM = AppWidgetManager.getInstance(this);
57 //2.获取窗体小部件布局转换成的view对象(定位应用的包名,当前应用中的那块布局文件)
58 RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.process_widget);
59 //3.给窗体小部件布view对象,内部控件赋值
60 remoteViews.setTextViewText(R.id.tv_process_count, "进程总数:"+ProcessInfoProvider.getProcessCount(this));
61 //4.显示可用内存大小
62 String strAvailSpace = Formatter.formatFileSize(this, ProcessInfoProvider.getAvailSpace(this));
63 remoteViews.setTextViewText(R.id.tv_process_memory, "可用内存:"+strAvailSpace);
64
65
66 //点击窗体小部件,进入应用
67 //1:在那个控件上响应点击事件2:延期的意图
68 Intent intent = new Intent("android.intent.action.HOME");
69 intent.addCategory("android.intent.category.DEFAULT");
70 PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
71 remoteViews.setOnClickPendingIntent(R.id.ll_root, pendingIntent);
72
73 //通过延期意图发送广播,在广播接受者中杀死进程,匹配规则看action
74 Intent broadCastintent = new Intent("android.intent.action.KILL_BACKGROUND_PROCESS");
75 PendingIntent broadcast = PendingIntent.getBroadcast(this, 0, broadCastintent, PendingIntent.FLAG_CANCEL_CURRENT);
76 remoteViews.setOnClickPendingIntent(R.id.btn_clear,broadcast);
77
78 //上下文环境,窗体小部件对应广播接受者的字节码文件
79 ComponentName componentName = new ComponentName(this,MyAppWidgetProvider.class);
80 //更新窗体小部件
81 aWM.updateAppWidget(componentName, remoteViews);
82 }
83 @Override
84 public IBinder onBind(Intent intent) {
85 return null;
86 }
87 @Override
88 public void onDestroy() {
89 if(mInnerReceiver!=null){
90 unregisterReceiver(mInnerReceiver);
91 }
92 //调用onDestroy即关闭服务,关闭服务的方法在移除最后一个窗体小部件的时调用,定时任务也没必要维护
93 cancelTimerTask();
94 super.onDestroy();
95 }
96 }
UpdateWidgetService
时间： 2024-08-06 03:44:33