моя программная сила закрывается. FATAL EXCEPTION: главное, пожалуйста, см. LogCat и код ниже

Question

logcat показывает что-то вроде кнопки не существует, но я не мог найти там никакой ошибки. Сила приложения закрывается, когда я нажимаю кнопку фонарика на главной странице активности. Я новичок в программировании на Android. пожалуйста помоги.

LogCat:

02-04 21:36:29.182: E/AndroidRuntime(798): FATAL EXCEPTION: main 
02-04 21:36:29.182: E/AndroidRuntime(798): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.iamtheonewhoknocks.toolkit/com.iamtheonewhoknocks.toolkit.FlashlightActivity}: java.lang.IllegalArgumentException: Button does not exist 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.os.Looper.loop(Looper.java:123) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread.main(ActivityThread.java:3683) 
02-04 21:36:29.182: E/AndroidRuntime(798): at java.lang.reflect.Method.invokeNative(Native Method) 
02-04 21:36:29.182: E/AndroidRuntime(798): at java.lang.reflect.Method.invoke(Method.java:507) 
02-04 21:36:29.182: E/AndroidRuntime(798): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
02-04 21:36:29.182: E/AndroidRuntime(798): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
02-04 21:36:29.182: E/AndroidRuntime(798): at dalvik.system.NativeStart.main(Native Method) 
02-04 21:36:29.182: E/AndroidRuntime(798): Caused by: java.lang.IllegalArgumentException: Button does not exist 
02-04 21:36:29.182: E/AndroidRuntime(798): at com.android.internal.app.AlertController.setButton(AlertController.java:288) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.AlertDialog.setButton(AlertDialog.java:161) 
02-04 21:36:29.182: E/AndroidRuntime(798): at com.iamtheonewhoknocks.toolkit.FlashlightActivity.onCreate(FlashlightActivity.java:42) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
02-04 21:36:29.182: E/AndroidRuntime(798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
02-04 21:36:29.182: E/AndroidRuntime(798): ... 11 more 

activity_main.xml

<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" 
    android:background="#151515" 
    android:orientation="horizontal" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:focusable="true" 
    tools:context=".MainActivity" > 

    <ImageButton 
     android:id="@+id/flashButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:background="@drawable/flashlight" 
     android:contentDescription="@string/flashlighticon" 
     android:drawableTop="@drawable/flashlight" /> 

    <ImageButton 
     android:id="@+id/convertorButton" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignTop="@+id/flashButton" 
     android:layout_centerHorizontal="true" 
     android:background="@drawable/converter" 
     android:contentDescription="@string/convertericon" /> 

    <ImageButton 
     android:id="@+id/mglassButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_alignLeft="@+id/compassButton" 
     android:layout_alignTop="@+id/mirrorButton" 
     android:background="@drawable/mglass" 
     android:contentDescription="@string/mglassicon" /> 

    <ImageButton 
     android:id="@+id/bubbleButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_alignLeft="@+id/convertorButton" 
     android:layout_below="@+id/flashButton" 
     android:layout_marginTop="87dp" 
     android:background="@drawable/bubble" 
     android:contentDescription="@string/bubbleicon" /> 

    <ImageButton 
     android:id="@+id/compassButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_above="@+id/mirrorButton" 
     android:layout_alignLeft="@+id/flashButton" 
     android:background="@drawable/compass" 
     android:contentDescription="@string/compassicon" /> 

    <ImageButton 
     android:id="@+id/mirrorButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_alignLeft="@+id/bubbleButton" 
     android:layout_below="@+id/bubbleButton" 
     android:layout_marginTop="83dp" 
     android:background="@drawable/mirror" 
     android:contentDescription="@string/mirroricon" /> 

    <ImageButton 
     android:id="@+id/timerButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_above="@+id/bubbleButton" 
     android:layout_alignLeft="@+id/calcButton" 
     android:background="@drawable/timer" 
     android:contentDescription="@string/timericon" /> 

    <ImageButton 
     android:id="@+id/calcButton" 
     android:layout_width="60dip" 
     android:layout_height="60dip" 
     android:layout_above="@+id/mirrorButton" 
     android:layout_alignParentRight="true" 
     android:background="@drawable/calculator" 
     android:contentDescription="@string/calcicon" /> 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/flashButton" 
     android:layout_below="@+id/flashButton" 
     android:layout_marginTop="19dp" 
     android:gravity="center" 
     android:text="@string/flashlighticon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/compassButton" 
     android:layout_below="@+id/compassButton" 
     android:layout_marginTop="17dp" 
     android:gravity="center" 
     android:text="@string/compassicon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView6" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView5" 
     android:layout_alignBottom="@+id/textView5" 
     android:layout_alignRight="@+id/calcButton" 
     android:gravity="center" 
     android:text="@string/calcicon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView7" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/mglassButton" 
     android:layout_below="@+id/mglassButton" 
     android:layout_marginTop="16dp" 
     android:gravity="center" 
     android:text="@string/mglassicon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView8" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView7" 
     android:layout_alignBottom="@+id/textView7" 
     android:layout_alignLeft="@+id/mirrorButton" 
     android:layout_alignRight="@+id/textView5" 
     android:gravity="center" 
     android:text="@string/mirroricon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView3" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView2" 
     android:layout_alignBottom="@+id/textView2" 
     android:layout_alignLeft="@+id/timerButton" 
     android:layout_alignRight="@+id/timerButton" 
     android:gravity="center" 
     android:text="@string/timericon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView1" 
     android:layout_alignBottom="@+id/textView1" 
     android:layout_centerHorizontal="true" 
     android:gravity="center" 
     android:text="@string/convertericon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/textView5" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView4" 
     android:layout_alignBottom="@+id/textView4" 
     android:layout_alignRight="@+id/textView2" 
     android:gravity="center" 
     android:text="@string/bubbleicon" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

</RelativeLayout> 

MainActivity.java

package com.iamtheonewhoknocks.toolkit; 

import android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.view.View; 
import android.widget.ImageButton; 


public class MainActivity extends Activity { 

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

     flashlightButton(); 
     calculatorButton(); 
     bubbleButton(); 
    } 

    private void flashlightButton() 
    { ImageButton flButton= (ImageButton) findViewById(R.id.flashButton); 
     flButton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       startActivity(new Intent(MainActivity.this,FlashlightActivity.class)); 

      } 
     }); 
    } 

     private void calculatorButton() 
     { ImageButton flButton= (ImageButton) findViewById(R.id.calcButton); 
      flButton.setOnClickListener(new View.OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        startActivity(new Intent(MainActivity.this,CalculatorActivity.class)); 

       } 
      }); 
     } 

     private void bubbleButton() 
     { ImageButton flButton= (ImageButton) findViewById(R.id.bubbleButton); 
      flButton.setOnClickListener(new View.OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        startActivity(new Intent(MainActivity.this,BubbleActivity.class)); 

       } 
      }); 
     } 

    /*@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; 
    } */ 


} 

activity_flashlight.xml

<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" 
    android:background="#000000" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".FlashlightActivity" > 

    <ImageButton 
     android:id="@+id/btnSwitch" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:background="@drawable/flashlight_off" 
     android:contentDescription="@null" /> 

</RelativeLayout> 

FlashlightActivity.java

package com.iamtheonewhoknocks.toolkit; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.pm.PackageManager; 
import android.hardware.Camera; 
import android.hardware.Camera.Parameters; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.ImageButton; 
//import android.view.View.OnClickListener; 

public class FlashlightActivity extends Activity { 
ImageButton switchButton; 

private Camera camera; 
private boolean isFlashOn; 
private boolean hasFlash; 
Parameters params; 
MediaPlayer mp; 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_flashlight); 
    switchButton = (ImageButton) findViewById(R.id.btnSwitch); 
    // First check if device is supporting flashlight or not   
    hasFlash = getApplicationContext().getPackageManager() 
      .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH); 

    if (!hasFlash) { 
     // device doesn't support flash 
     // Show alert message and close the application 
     AlertDialog alert = new AlertDialog.Builder(FlashlightActivity.this) 
       .create(); 
     alert.setTitle("Error"); 
     alert.setMessage("Sorry, your device doesn't support flash light!"); 
     alert.setButton(0,"OK", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       // closing the application 
       finish(); 
      } 
     }); 
     alert.show(); 
     return; 
    } 

    // get the camera 
    getCamera(); 

    // displaying button image 
    toggleButtonImage(); 


    // Switch button click event to toggle flash on/off 
    switchButton.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      if (isFlashOn) { 
       // turn off flash 
       turnOffFlash(); 
      } else { 
       // turn on flash 
       turnOnFlash(); 
      } 
     } 
    }); 
} 


// Get the camera 
private void getCamera() { 
    if (camera == null) { 
     try { 
      camera = Camera.open(); 
      params = camera.getParameters(); 
     } catch (RuntimeException e) { 
      Log.e("Camera Error. Failed to Open. Error: ", e.getMessage()); 
     } 
    } 
} 


// Turning On flash 
private void turnOnFlash() { 
    if (!isFlashOn) { 
     if (camera == null || params == null) { 
      return; 
     } 
     // play sound 
     // playSound(); 

     params = camera.getParameters(); 
     params.setFlashMode(Parameters.FLASH_MODE_TORCH); 
     camera.setParameters(params); 
     camera.startPreview(); 
     isFlashOn = true; 

     // changing button/switch image 
     toggleButtonImage(); 
    } 

} 


// Turning Off flash 
private void turnOffFlash() { 
    if (isFlashOn) { 
     if (camera == null || params == null) { 
      return; 
     } 
     // play sound 
    //  playSound(); 

     params = camera.getParameters(); 
     params.setFlashMode(Parameters.FLASH_MODE_OFF); 
     camera.setParameters(params); 
     camera.stopPreview(); 
     isFlashOn = false; 

     // changing button/switch image 
     toggleButtonImage(); 
    } 
} 
/* 
* Toggle switch button images 
* changing image states to on/off 
* */ 
private void toggleButtonImage(){ 
    if(isFlashOn){ 
     switchButton.setImageResource(R.drawable.flashlight_on); 
    }else{ 
     switchButton.setImageResource(R.drawable.flashlight_off); 
    } 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 

    // on pause turn off the flash 
    turnOffFlash(); 
} 

@Override 
protected void onRestart() { 
    super.onRestart(); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    // on resume turn on the flash 
    if(hasFlash) 
     turnOnFlash(); 
} 

@Override 
protected void onStart() { 
    super.onStart(); 

    // on starting the app get the camera params 
    getCamera(); 
} 

@Override 
protected void onStop() { 
    super.onStop(); 

    // on stop release the camera 
    if (camera != null) { 
     camera.release(); 
     camera = null; 
    } 
} 

/* 

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

}

файл манифеста

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.iamtheonewhoknocks.toolkit" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="17" /> 

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

    <uses-feature android:name="android.hardware.camera" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="com.iamtheonewhoknocks.toolkit.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name="com.iamtheonewhoknocks.toolkit.FlashlightActivity" 
      android:label="@string/title_activity_flashlight" > 
     </activity> 
     <activity 
      android:name="com.iamtheonewhoknocks.toolkit.CalculatorActivity" 
      android:label="@string/title_activity_calculator" > 
     </activity> 
     <activity 
      android:name="com.iamtheonewhoknocks.toolkit.TimerActivity" 
      android:label="@string/title_activity_timer" > 
     </activity> 
     <activity 
      android:name="com.iamtheonewhoknocks.toolkit.BubbleActivity" 
      android:label="@string/title_activity_bubble" > 
     </activity> 
    </application> 

</manifest> 

Answer 1

Вы должны изменить этот раздел

alert.setButton(0,"OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      // closing the application 
      finish(); 
     } 
    }); 

в

alert.setButton(DialogInterface.BUTTON_POSITIVE,"OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      // closing the application 
      finish(); 
     } 
    }); 

Ошибка появляется, потому что значение 0 равно unknown to the method you're using.

Answer 2

Взгляните на то, что говорит доктор,

Этот метод не рекомендуется в уровне API 3. Использование setButton (интермедиат, CharSequence, android.content.DialogInterface.OnClickListener) с BUTTON_POSITIVE

так что вместо передачи int (0) напрямую, вы должны использовать DialogInterface.BUTTON_POSITIVE. Кроме того, вы можете напрямую использовать

alert.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      // closing the application 
      finish(); 
     } 
    });