android 重新进入前台,Android 从后台进入前台

public void moveTaskToFront(int taskId, int flags) {

try {

ActivityManagerNative.getDefault().moveTaskToFront(taskId, flags);

} catch (RemoteException e) {

// System dead, we will be dead too soon!

}

//获取ActivityManager

ActivityManager mAm = (ActivityManager) context.getSystemService(context.ACTIVITY_SERVICE);

//获得当前运行的task

List

for (ActivityManager.RunningTaskInfo rti : taskList) {

//找到当前应用的task，并启动task的栈顶activity，达到程序切换到前台

if(rti.topActivity.getPackageName().equals(context.getPackageName())) {

mAm.moveTaskToFront(rti.id,0);

return;

}

}

//若没有找到运行的task，用户结束了task或被系统释放，则重新启动mainactivity

Intent resultIntent = new Intent(context, MainActivity.class);

resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_SINGLE_TOP);

context.startActivity(resultIntent);