Android定時器應用程序

Question

無論如何，當我設置計時器時，即使重新啓動手機，它仍會運行？像鬧鐘一樣，當我重新啓動手機時，它仍然在那裏。如果有可能我可以得到它的代碼？我真的需要它。

Answer 1

是的，你可以做到這一點，但目前我還沒有代碼。 我可以給你製作你自己的步驟。

步驟

1在您的活動創建CountDownTimer

  // 10 minutes Timer And 1 Second Delay 
      new CountDownTimer(10*30*1000, 1000) { 

       public void onTick(long millisUntilFinished) { 
        // save `millisUntilFinished` to sharedpreferences 
       } 

       public void onFinish() { 

        // clear sharedPreferences when it finished 
        //and do whatever you want after finishing the timer here 
       } 
      }.start(); 

2 - 創建一個BroadCastReceiver與BOOT_COMPLETED行動與上次保存的值重新啓動定時器從Sharedpreferences

@Override 
public void onReceive(Context context, Intent intent) { 

    //again Start your timer from here 

    // Get millisUntilFinished from SharedPreference 
    millisUntilFinished = Long.parseLong(getLastSavedValueFromSharedPreferences()); 

    new CountDownTimer(millisUntilFinished, 1000) { 

     public void onTick(long millisUntilFinished) { 
      // save `millisUntilFinished` to sharedpreferences 
     } 

     public void onFinish() { 

      // clear sharedPreferences when it finished 
      // and do whatever you want after finishing the timer here 
     } 
    }.start(); 
} 

就是這樣。

EDIT

步驟1-創建TestActivity.java類

public class TestActivity extends AppCompatActivity { 

    SharedPreferences sharedPreferences; 
    SharedPreferences.Editor editor; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.test_work); 

     sharedPreferences = getSharedPreferences("MySharedPref", MODE_PRIVATE); 
     editor = sharedPreferences.edit(); 

     startTimer(); 

    } 

    private void startTimer() { 

     // 10 min Timer 
     new CountDownTimer(10*60*1000, 1000) 
     { 
      @Override 
      public void onTick(long millisUntilFinished) { 

       editor.putLong("millisUntilFinished", millisUntilFinished); 
       editor.commit(); 
      } 

      @Override 
      public void onFinish() { 

       editor.clear(); 
       // Do your work Here 
      } 
     }.start(); 
    } 
} 

步驟2-創建BootReceiver.java類

public class BootReceiver extends BroadcastReceiver { 

    SharedPreferences sharedPreferences; 
    SharedPreferences.Editor editor; 

    @Override 
    public void onReceive(final Context context, final Intent intent) { 

     sharedPreferences = context.getSharedPreferences("MySharedPref", context.MODE_PRIVATE); 
     editor = sharedPreferences.edit(); 

     startTimer(); 
    } 

    private void startTimer() { 

     // get remaining time from sharedPreferences 
     long millisUntilFinished = sharedPreferences.getLong("millisUntilFinished", 0); 

     // 10 min Timer 
     new CountDownTimer(millisUntilFinished, 1000) 
     { 
      @Override 
      public void onTick(long millisUntilFinished) { 

       editor.putLong("millisUntilFinished", millisUntilFinished); 
       editor.commit(); 
      } 

      @Override 
      public void onFinish() { 

       editor.clear(); 
       // Do your work Here 
      } 
     }.start(); 
    } 
} 

步驟3-在AndroidManifest.xml文件註冊你的接收機

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> 

<!--Register your BootReceiver here--> 
    <receiver android:name=".receiver.BootReceiver"> 
     <intent-filter > 
      <action android:name="android.intent.action.BOOT_COMPLETED" /> 
     </intent-filter> 
    </receiver> 

以下是完整的代碼。你只需要按照步驟。