Android: 自动注销

Question

嗨，我想在确定的不活动时间后自动注销我的 Android 应用程序。在 onPause 的第二个 Activity 中，我将应用程序暂停的时间保存在一个变量中。在 MainActivity 方法 onresume 中，我将应用程序重新启动的时间保存在另一个变量中并计算两个变量之间的差异。如果这个差异大于一个确定的时间，例如 10 秒有注销。

我的主代码Activity：

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();
    }

}

第二个Activity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();
        }

}

这个方法不行，因为第一次没问题，第二次就不行了，就是没有注销。我该如何解决这个问题？

Answer 1

我建议您使用 countDownTimer，打开应用程序后立即启动。

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();

Answer 2

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 
    }
}

不要忘记在您的应用程序标签内的清单中添加接收器：

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

在暂停时添加取消注册您的广播。

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