0

画像ボタンの透明領域をクリックできないようにしようとすると例外が発生します。OnTouchListener を実装しようとすると、実行時例外が発生します。この問題を解決するために私を助けてください。

ImageButton imgView= (ImageButton) findViewById(R.id.imageButton1);
     imgView.setDrawingCacheEnabled(true);
     imgView.setOnTouchListener(new OnTouchListener(){


    //private final OnTouchListener changeColorListener = new OnTouchListener() {      
         @Override     
         public boolean onTouch(View v, MotionEvent event) {        
          Bitmap bmp = Bitmap.createBitmap(v.getDrawingCache());        
          int color = bmp.getPixel((int) event.getX(),(int) event.getY());         
         if (color == Color.TRANSPARENT)            
          return false;        
          else {             
         //code to execute
         Toast.makeText(MainActivity.this, "Image button is being clicked", Toast.LENGTH_SHORT).show();             
         return true;         
         }     
         }


         });
}

}

MainActivity.XML ファイル

<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/worldfinal"
tools:context=".MainActivity" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="SELECT A DESIRED COUNTRY" />

<ImageButton
    android:id="@+id/imageButton1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/textView1"
    android:layout_marginRight="28dp"
    android:layout_marginTop="93dp"
    android:src="@drawable/india1" 
    android:background="@android:color/transparent"  />

ログファイルは

    08-06 10:52:04.471: E/AndroidRuntime(329): FATAL EXCEPTION: main
08-06 10:52:04.471: E/AndroidRuntime(329): java.lang.NullPointerException
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.graphics.Bitmap.createBitmap(Bitmap.java:367)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.sunojsworkshop.MainActivity$1.onTouch(MainActivity.java:34)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.View.dispatchTouchEvent(View.java:3881)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.os.Looper.loop(Looper.java:123)
08-06 10:52:04.471: E/AndroidRuntime(329):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-06 10:52:04.471: E/AndroidRuntime(329):  at java.lang.reflect.Method.invokeNative(Native Method)
08-06 10:52:04.471: E/AndroidRuntime(329):  at java.lang.reflect.Method.invoke(Method.java:507)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-06 10:52:04.471: E/AndroidRuntime(329):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-06 10:52:04.471: E/AndroidRuntime(329):  at dalvik.system.NativeStart.main(Native Method)
4

3 に答える 3

0

これを試して：

このメソッドを実装します。

public static Bitmap loadBitmapFromView(View v) {
     Bitmap b = Bitmap.createBitmap( v.getLayoutParams().width, v.getLayoutParams().height, Bitmap.Config.ARGB_8888);                
     Canvas c = new Canvas(b);
     v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
     v.draw(c);
     return b;
}

そしてあなたの OnTouchListners OnTouch:

@Override     
         public boolean onTouch(View v, MotionEvent event) {        
          Bitmap bmp = loadBitmapFromView(v);     
          int color = bmp.getPixel((int) event.getX(),(int) event.getY());         
         if (color == Color.TRANSPARENT)            
          return false;        
          else {             
         //code to execute
         Toast.makeText(MainActivity.this, "Image button is being clicked", Toast.LENGTH_SHORT).show();             
         return true;         
              }     
            }
         });
于 2013-08-06T06:44:58.287 に答える
0

リソースの 1 つがドローアブル フォルダーにありません。@drawable/india1 である可能性があります

于 2013-08-06T06:42:03.880 に答える
0

india1 イメージが存在する場合は、次のことを試してください。

    public static Bitmap loadBitmapFromView(View v) {
     Bitmap b = Bitmap.createBitmap( v.getLayoutParams().width, v.getLayoutParams().height, Bitmap.Config.ARGB_8888);                
     Canvas c = new Canvas(b);
     v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
     v.draw(c);
     return b;
}
于 2013-08-06T06:42:34.110 に答える