位圖類的createBitmap方法返回錯誤

Question

我有一個問題，我正在編寫縮放位圖的代碼，並創建新的Bitmap usint Bitmap.createBitmap（）方法，它總是返回一個我無法識別的錯誤。請給我建議任何解決方案。

ErrorStack：

02-22 16:27:14.679: E/AndroidRuntime(10363): FATAL EXCEPTION: main 
02-22 16:27:14.679: E/AndroidRuntime(10363): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.TestFace.FaceDetect/com.TestFace.FaceDetect.ProcessImage}: java.lang.IllegalArgumentException: width and height must be > 0 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.os.Looper.loop(Looper.java:123) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread.main(ActivityThread.java:4627) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at java.lang.reflect.Method.invokeNative(Native Method) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at java.lang.reflect.Method.invoke(Method.java:521) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at dalvik.system.NativeStart.main(Native Method) 
02-22 16:27:14.679: E/AndroidRuntime(10363): Caused by: java.lang.IllegalArgumentException: width and height must be > 0 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.graphics.Bitmap.nativeCreate(Native Method) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.graphics.Bitmap.createBitmap(Bitmap.java:468) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.graphics.Bitmap.createBitmap(Bitmap.java:435) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at com.TestFace.FaceDetect.ProcessImage.scaleImage(ProcessImage.java:247) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at com.TestFace.FaceDetect.ProcessImage.onCreate(ProcessImage.java:67) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
02-22 16:27:14.679: E/AndroidRuntime(10363): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
02-22 16:27:14.679: E/AndroidRuntime(10363): ... 11 more 

代碼：

private Bitmap scaleImage(Bitmap paramBitmap) { 
     // TODO Auto-generated method stub 
     int i = paramBitmap.getWidth(); 
     System.out.println("Width========="+i); 
      int j = paramBitmap.getHeight(); 
      System.out.println("Height========="+j); 
      float f2 = j/i * 300; 
      float f1 = 300/i; 
      f2 /= j; 
      Matrix localMatrix = new Matrix(); 
      localMatrix.postScale(f1, f2); 
      return Bitmap.createBitmap(paramBitmap, 0, 0, i, j, localMatrix, false); 
    } 

Answer 1

嘗試使用Bitmap.createScaledBitmap

Bitmap.createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter);