1.AndroidManifest.xml根據窗體小部件廣播接受者關鍵字android.appwidget.action.APPWIDGET_UPDATE 搜索android:resource="@xml/process_widget_provider" 2.找到xml文件夾下process_wid ...
1.AndroidManifest.xml根據窗體小部件廣播接受者關鍵字android.appwidget.action.APPWIDGET_UPDATE
搜索android:resource="@xml/process_widget_provider"
2.找到xml文件夾下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指向的佈局文件process_widget
4.窗體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 //創建第一個窗體小部件的方法 11 Log.i(tag, "onEnabled 創建第一個窗體小部件調用方法"); 12 //開啟服務(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 創建多一個窗體小部件調用方法"); 20 //開啟服務 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 //當窗體小部件寬高發生改變的時候調用方法,創建小部件的時候,也調用此方法 29 //開啟服務 30 context.startService(new Intent(context, UpdateWidgetService.class)); 31 Log.i(tag, "onAppWidgetOptionsChanged 創建多一個窗體小部件調用方法"); 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 刪除一個窗體小部件調用方法"); 39 super.onDeleted(context, appWidgetIds); 40 } 41 42 @Override 43 public void onDisabled(Context context) { 44 Log.i(tag, "onDisabled 刪除最後一個窗體小部件調用方法"); 45 //關閉服務 46 context.stopService(new Intent(context, UpdateWidgetService.class)); 47 super.onDisabled(context); 48 } 49 }MyAppWidgetProvider
5.窗體小部件的更新進程總數和可用記憶體大小
1.將更新過程放置在服務中,服務什麼時候開啟?服務什麼時候關閉?
2.一旦出現窗體小部件,則需要開啟服務,所有窗體小部件銷毀的時候,關閉服務
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 //管理進程總數和可用記憶體數更新(定時器) 8 startTimer(); 9 10 //註冊開鎖,解鎖廣播接受者 11 IntentFilter intentFilter = new IntentFilter(); 12 //開鎖action 13 intentFilter.addAction(Intent.ACTION_SCREEN_ON); 14 //解鎖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 //開啟定時更新任務 28 startTimer(); 29 }else{ 30 //關閉定時更新任務 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定時刷新 42 updateAppWidget(); 43 Log.i(tag, "5秒一次的定時任務現在正在運行.........."); 44 } 45 }, 0, 5000); 46 } 47 public void cancelTimerTask() { 48 //mTimer中cancel方法取消定時任務方法 49 if(mTimer!=null){ 50 mTimer.cancel(); 51 mTimer = null; 52 } 53 } 54 protected void updateAppWidget() { 55 //1.獲取AppWidget對象 56 AppWidgetManager aWM = AppWidgetManager.getInstance(this); 57 //2.獲取窗體小部件佈局轉換成的view對象(定位應用的包名,當前應用中的那塊佈局文件) 58 RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.process_widget); 59 //3.給窗體小部件布view對象,內部控制項賦值 60 remoteViews.setTextViewText(R.id.tv_process_count, "進程總數:"+ProcessInfoProvider.getProcessCount(this)); 61 //4.顯示可用記憶體大小 62 String strAvailSpace = Formatter.formatFileSize(this, ProcessInfoProvider.getAvailSpace(this)); 63 remoteViews.setTextViewText(R.id.tv_process_memory, "可用記憶體:"+strAvailSpace); 64 65 66 //點擊窗體小部件,進入應用 67 //1:在那個控制項上響應點擊事件2:延期的意圖 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 //通過延期意圖發送廣播,在廣播接受者中殺死進程,匹配規則看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 //上下文環境,窗體小部件對應廣播接受者的位元組碼文件 79 ComponentName componentName = new ComponentName(this,MyAppWidgetProvider.class); 80 //更新窗體小部件 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 //調用onDestroy即關閉服務,關閉服務的方法在移除最後一個窗體小部件的時調用,定時任務也沒必要維護 93 cancelTimerTask(); 94 super.onDestroy(); 95 } 96 }UpdateWidgetService
