从 onReceive 方法启动 android 应用程序（如果它不存在）

Question

我在后台服务中有一个计时器。它广播一个意图，该意图在活动onReceive() 中接收 如果应用程序被用户杀死，我想启动它。否则我想继续使用该应用程序。我正在使用以下代码从onReceive() 重新启动应用程序。

if(/*Application is killed*/) {
    Intent i = new Intent(context, MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
}

if 块中应该使用哪个条件？

Answer 1

您只需要在接收时检查您的应用程序是否正在运行

代码片段

boolean isApplicationRunning = false;
ActivityManager activityManager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
List<RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
for(int i = 0; i < procInfos.size(); i++){
if(procInfos.get(i).processName.equals("com.me.checkprocess")){
    Log.e("Result", "App is running - Doesn't need to reload");
    isApplicationRunning = true;
    break;
 } 
 else
 {
    Log.e("Result", "App is not running - Needs to reload);
  }
}

然后就可以执行了

if(isApplicationRunning) {
Intent i = new Intent(context, MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);

}

Answer 2

我不知道这是否正确，但以下代码对我有用。

private boolean isApplicationAlive(Context context) {
    boolean applicationAlive = false;
    ActivityManager m = (ActivityManager) context.getSystemService( context.ACTIVITY_SERVICE );
    List<ActivityManager.RunningTaskInfo> runningTaskInfoList =  m.getRunningTasks(10);
    Iterator<ActivityManager.RunningTaskInfo> itr = runningTaskInfoList.iterator();
    while(itr.hasNext()){
        ActivityManager.RunningTaskInfo runningTaskInfo = (ActivityManager.RunningTaskInfo)itr.next();
        String activityName = runningTaskInfo.topActivity.getShortClassName();                
        if(activityName.equalsIgnoreCase(".activities.MainActivity")) {
            applicationAlive = true;
        }

    }          
    return applicationAlive;
}

Answer 3

要检查您的应用程序是否正在运行，您可以做的是：-

if(isProcessRunning("package_name")) {
    Intent i = new Intent(context, MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
}


public boolean isProcessRunning(String process) {
    ActivityManager activityManager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
    List<RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
    for(int i = 0; i < procInfos.size(); i++){
        if (procInfos.get(i).processName.equals(process)) {
            return true;
        }  
    }
    return false;
}

试试这个，它会起作用的。

如果您的应用程序只有一个或两个活动，或者如果您的应用程序有一个由其他活动扩展的 BaseActivity，请执行以下操作：-

 public class MyApplication extends Application{
  private static boolean mIsRunning = false;

  public static boolean isRunning(){
    return mIsRunning;
  }
 public void setRunning(boolean isRunning){
   mIsRunning = isRunning;
 }
 }

从你的活动做：-

public void onCreate(Bundle savedInstanceState){
  MyApplication.setRunning(true);
}

public void onDestroy(){
  MyApplication.setRunning(false);
}

你可以这样检查：-

if(!MyApplication.isRunning()) {
    Intent i = new Intent(context, MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
}