Question

您好，我希望在确定的不活动时间后自动退出我的Android应用。在onPause的第二个活动中，我保存了应用程序在变量中暂停的时间。在方法onresume中的MainActivity中，我节省了应用程序在另一个变量中重新启动的时间并计算两个变量之间的差异。如果此差异大于确定的时间，例如10秒退出。

我的MainActivity的代码：

public class MainActivity extends Activity {

    private EditText username,password;
    public static final String MyPREFERENCES = "MyPrefs" ;
    public static final String name = "nameKey"; 
    public static final String pass = "passwordKey"; 
    SharedPreferences sharedpreferences;

    public static Long t0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        username = (EditText)findViewById(R.id.editText1);
        password = (EditText)findViewById(R.id.editText2);

        username.setText("***");
        password.setText("***");

        t0 = Welcome.t0;
    }


    @Override
    protected void onResume() {
        sharedpreferences=getSharedPreferences(MyPREFERENCES, 
                Context.MODE_PRIVATE);
        if (sharedpreferences.contains(name))
        {
            if(sharedpreferences.contains(pass)){
                Intent i = new Intent(this,SecondActivity.class);
                startActivity(i);
            }

        Calendar c = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
        String strDate = sdf.format(c.getTime());
        System.out.println(strDate);

        Date d;
        try {
            d = sdf.parse(strDate);
            long second2=d.getSeconds();

            long ts=Math.abs(second2-t0);

            if (ts>=10){

                logout();
                Intent i2 = new Intent(this,MainActivity.class);
                startActivity(i2);
                }

        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
        super.onResume();
    }

    public void login(View view){
        Editor editor = sharedpreferences.edit();
        String u = username.getText().toString();
        String p = password.getText().toString();
        if(u.equals("***") && p.equals("***")){

            editor.putString(name, u);
            editor.putString(pass, p);
            editor.commit();
            Intent i = new Intent(this,SecondActivity.Welcome.class);
            startActivity(i); 
        }
        else{
            Toast.makeText(MainActivity.this, "ko", Toast.LENGTH_SHORT).show();

        }
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    public void onPause() {
        super.onPause();
        this.finish();
    }

    public void closing() {
        finish();
    }

    public void logout(){
        SharedPreferences sharedpreferences = getSharedPreferences
                (MainActivity.MyPREFERENCES, Context.MODE_PRIVATE);
        Editor editor = sharedpreferences.edit();

        editor.clear();
        editor.commit();
        moveTaskToBack(true); 
        this.finish();
    }

}

第二活动的代码是：

public class Second extends Activity {

    static Long t0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_welcome);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.welcome, menu);
        return true;
    }
    public void logout(View view){
        SharedPreferences sharedpreferences = getSharedPreferences
                (MainActivity.MyPREFERENCES, Context.MODE_PRIVATE);
        Editor editor = sharedpreferences.edit();

        editor.clear();
        editor.commit();
        moveTaskToBack(true); 
        this.finish();
    }

    public void exit(View view){

        moveTaskToBack(true); 
        this.finish();

    }

     public void onPause() {
     super.onPause();
            Calendar c = Calendar.getInstance();
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            String strDate = sdf.format(c.getTime());


                            Date d;
                            try {
                                d = sdf.parse(strDate);
                                long second=d.getSeconds();

                                Welcome.t0=second;

                            } catch (ParseException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }

                            this.finish();

       }

        public void closing() {
            finish();
        }

}

这种做法很有效，因为它在第一次工作正常但第二次没有工作时，没有注销。我该如何解决这个问题？

Answer 1

设置闹钟：

Calendar cal = Calendar.getInstance();

cal.add(Calendar.MINUTE, "YourTimeinMinutes"); // you can use Calendar.Seconds etc according to your need

Intent intent = new Intent(YourActivity.this, AlarmReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(YourActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

// Get the AlarmManager service
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);

AlarmReceiver.class

public class AlarmReceiver extends BroadcastReceiver 
{
    @Override
    public void onReceive(Context context, Intent intent) 
    {   
        //your logic 
    }
}

不要忘记在应用程序标记内的清单中添加接收器：

  <receiver  android:name=".AlarmReceiver"  ></receiver>

添加注销你的广播onPause。

Answer 2

我建议您使用countDownTimer，一打开应用程序就会启动。

new CountDownTimer(10000, 1000) {//CountDownTimer for 10 seconds

 public void onTick(long millisUntilFinished) {
     }

 public void onFinish() {
     //logout here.
SharedPreferences sharedpreferences = getSharedPreferences
            (MainActivity.MyPREFERENCES, Context.MODE_PRIVATE);
    Editor editor = sharedpreferences.edit();

    editor.clear();
    editor.commit();
    moveTaskToBack(true); 
    this.finish();
 }
}
.start();

Android：自动退出

2 个答案: