在 \res\xml下新建example_appwidget_info.xml
在layout下新建process_widget.xml,用来显示widget的布局
新建一个类ProcessWidget继承AppWidgetProvider
import cn.itcast.mobilesafe.service.UpdateWidgetService;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.sax.StartElementListener;
public class ProcessWidget extends AppWidgetProvider {
Intent intent;
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
intent = new Intent(context,UpdateWidgetService.class);
context.stopService(intent);
}
@Override
public void onEnabled(Context context) {
super.onEnabled(context);
intent = new Intent(context,UpdateWidgetService.class);
context.startService(intent);
}
}
新建类UpdateWidgetService实现widget更新
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Intent;
import android.graphics.Color;
import android.os.IBinder;
import android.widget.RemoteViews;
public class UpdateWidgetService extends Service {
private Timer timer ;
private TimerTask task;
private AppWidgetManagerwidgetmanager;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
timer = new Timer();
widgetmanager =AppWidgetManager.getInstance(getApplicationContext());
task = new TimerTask() {
@Override
public void run() {
// 更新widget的界面
ComponentName name = new ComponentName("cn.itcast.mobilesafe", "cn.itcast.mobilesafe.receiver.ProcessWidget");
RemoteViews views = new RemoteViews("cn.itcast.mobilesafe", R.layout.process_widget);
views.setTextViewText(R.id.process_count, "进程数目"+TaskUtil.getProcessCount(getApplicationContext()));
views.setTextColor(R.id.process_count, Color.RED);
views.setTextViewText(R.id.process_memory, "可用内存"+TaskUtil.getMemeorySize(getApplicationContext()));
views.setTextColor(R.id.process_memory, Color.RED);
Intent intent = new Intent(UpdateWidgetService.this,LockScreenReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
views.setOnClickPendingIntent(R.id.btn_clear, pendingIntent);
widgetmanager.updateAppWidget(name, views);
}
};
timer.scheduleAtFixedRate(task, 1000, 2000);
super.onCreate();
}
@Override
public void onDestroy() {
timer.cancel();
timer = null;
task =null;
super.onDestroy();
}
}
TaskUtil的代码如下：
import java.util.List;
import android.app.ActivityManager;
import android.app.ActivityManager.MemoryInfo;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.Context;
import android.text.TextUtils;
public class TaskUtil {
public static void killAllProcess(Context context) {
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List runningapps = am.getRunningAppProcesses();
for (RunningAppProcessInfo info : runningapps) {
String packname = info.processName;
am.killBackgroundProcesses(packname);
}
}
public static int getProcessCount(Context context) {
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List runningapps = am.getRunningAppProcesses();
return runningapps.size();
}
public static String getMemeorySize(Context context) {
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
MemoryInfo outInfo = new ActivityManager.MemoryInfo();
am.getMemoryInfo(outInfo);
return TextFormater.getDataSize( outInfo.availMem);
}
}
在AndroidManifest.xml的配置
