按下按钮时不停止的方法

Question

我是android新手。我做了一个简单的火炬灯应用程序。一切都很好，但闪烁的部分正在造成问题。如果我按下“眨眼”按钮，手电筒开始闪烁，但是当我再次按下按钮时，闪烁不会停止，而是闪烁加起来。例如，如果我按下按钮两次，则该功能执行两次。如果它为了那么它必须在第二次按下时停止。任何人都有解决方案。请帮忙。

这里是MainActivity.java

package epicerastudios.torch; 

import android.content.Context; 
import android.content.DialogInterface; 
import android.content.pm.PackageManager; 
import android.hardware.camera2.CameraAccessException; 
import android.hardware.camera2.CameraManager; 
import android.os.Build; 
import android.os.Bundle; 
import android.support.v7.app.AlertDialog; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.view.View; 
import android.widget.ImageButton; 


public class MainActivity extends AppCompatActivity { 

private CameraManager mCameraManager; 
private String mCameraId; 
private ImageButton mTorchOnOffButton; 
private ImageButton mBlinkOnOffButton; 
private Boolean isTorchOn; 
private Boolean isBlinkOn; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.d("FlashLightActivity", "onCreate()"); 
    setContentView(R.layout.activity_main); 
    mTorchOnOffButton = (ImageButton) findViewById(R.id.Switch); 
    mBlinkOnOffButton = (ImageButton) findViewById(R.id.Blink) ; 
    isTorchOn = false; 
    isBlinkOn = false; 

    Boolean isFlashAvailable = getApplicationContext().getPackageManager() 
      .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH); 

    if (!isFlashAvailable) { 

     AlertDialog alert = new AlertDialog.Builder(MainActivity.this) 
       .create(); 
     alert.setTitle("Error !!"); 
     alert.setMessage("Your device doesn't support flash light!"); 
     alert.setButton(DialogInterface.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       // closing the application 
       finish(); 
       System.exit(0); 
      } 
     }); 
     alert.show(); 
     return; 
    } 
    mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); 
    try { 
     mCameraId = mCameraManager.getCameraIdList()[0]; 
    } catch (CameraAccessException e) { 
     e.printStackTrace(); 
    } 

    mTorchOnOffButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      try { 
       if (isTorchOn) { 
        turnOffFlashLight(); 
        isTorchOn = false; 
       } else { 
        turnOnFlashLight(); 
        isTorchOn = true; 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 

    mBlinkOnOffButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

       if (isBlinkOn) { 
        turnOffBlink(); 
        isBlinkOn = false; 
       } else { 
        turnOnBlink(); 
        isBlinkOn = true; 
       } 

     } 
    }); 
} 
public void turnOnFlashLight() { 

    try { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
      mCameraManager.setTorchMode(mCameraId, true); 

      mTorchOnOffButton.setImageResource(R.drawable.btn_on); 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 


public void turnOffFlashLight() { 

    try { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
      mCameraManager.setTorchMode(mCameraId, false); 

      mTorchOnOffButton.setImageResource(R.drawable.btn_off); 

     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

public void turnOnBlink() { 
    mBlinkOnOffButton.setImageResource(R.drawable.blink_on); 
    String myString = "0101010101"; 
    long blinkDelay = 300; //Delay in ms 
    for (int i = 0; i < myString.length(); i++) { 
     if (myString.charAt(i) == '0') { 
     try { 
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
       mCameraManager.setTorchMode(mCameraId, true); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
     else { 
      try { 
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
        mCameraManager.setTorchMode(mCameraId, false); 
       } 
      } 
      catch (Exception e){ 
       e.printStackTrace(); 
      } 
     } 

     try { 
      Thread.sleep(blinkDelay); 
     } catch (InterruptedException e) { 
      e.printStackTrace(); 
     } 
    } 

} 

public void turnOffBlink() { 

    try { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
      mCameraManager.setTorchMode(mCameraId, false); 

      mBlinkOnOffButton.setImageResource(R.drawable.blink_off); 

     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

@Override 
protected void onStop() { 
    super.onStop(); 
    if(isTorchOn || isBlinkOn){ 
     turnOffFlashLight(); 
     turnOffBlink(); 
    } 
} 


@Override 
protected void onPause() { 
    super.onPause(); 
    if(isTorchOn || isBlinkOn){ 
     turnOffFlashLight(); 
     turnOffBlink(); 
    } 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    if(isTorchOn || isBlinkOn){ 
     turnOnFlashLight(); 
     turnOnBlink(); 
    } 
} 
} 

这里是我的activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="epicerastudios.torch.MainActivity" 
android:background="#fff"> 

<ImageButton 
    android:id="@+id/Switch" 
    android:layout_width="250dp" 
    android:layout_height="wrap_content" 
    android:background="#fff" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" 
    android:src="@drawable/btn_off" /> 

<ImageButton 
    android:id="@+id/Blink" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_below="@id/Switch" 
    android:layout_alignLeft="@id/Switch" 

    android:background="#fff" 

    android:src="@drawable/blink_off" /> 

    </RelativeLayout> 

Answer 1

我认为这是becouse你for循环未停止当你再次按下按钮时。

public void turnOnBlink() { 
mBlinkOnOffButton.setImageResource(R.drawable.blink_on); 
String myString = "0101010101"; 
long blinkDelay = 300; //Delay in ms 
for (int i = 0; i < myString.length(); i++) { 
    if(!isBlinkOn) { 
    break; 
    } 
    if (myString.charAt(i) == '0') { 
    try { 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
      mCameraManager.setTorchMode(mCameraId, true); 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

按钮

mBlinkOnOffButton.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View v) { 

      if (isBlinkOn) { 
       isBlinkOn = false; 
       turnOffBlink(); 
      } else { 
       isBlinkOn = true; 
       turnOnBlink(); 
      } 

    } 
});