Bitmap.createBitmap参数异常之java.lang.IllegalArgumentException: width and height must be > 0

来源：互联网发布：gzip压缩算法比较编辑：程序博客网时间：2024/05/14 18:55

代码：

public static Bitmap readBitmapInSize(Context paramContext, int paramInt,

int width, int height) {

Matrix matrix = new Matrix();

Bitmap bitmap = readBitmap(paramContext, paramInt);

matrix.setScale( width / bitmap.getWidth(), height

/ bitmap.getHeight());

Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),

bitmap.getHeight(), matrix, true);

return resizeBmp;

}

报错信息：

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): FATAL EXCEPTION: main

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): java.lang.IllegalArgumentException: width and height must be > 0

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.graphics.Bitmap.createBitmap(Bitmap.java:603)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.graphics.Bitmap.createBitmap(Bitmap.java:551)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.zoipuus.mypet.util.BitmapOperation.readBitmapInSize(BitmapOperation.java:31)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.zoipuus.mypet.util.CreateViewUtil.createIconView(CreateViewUtil.java:45)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.zoipuus.mypet.service.MyWindowService.createIconView(MyWindowService.java:91)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.zoipuus.mypet.view.MoveImageView.onTouchEvent(MoveImageView.java:155)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.View.dispatchTouchEvent(View.java:5541)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.View.dispatchPointerEvent(View.java:5721)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2890)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2466)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:845)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2475)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.os.Handler.dispatchMessage(Handler.java:99)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.os.Looper.loop(Looper.java:137)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at android.app.ActivityThread.main(ActivityThread.java:4424)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at java.lang.reflect.Method.invokeNative(Native Method)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at java.lang.reflect.Method.invoke(Method.java:511)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

05-04 13:25:36.422: ERROR/AndroidRuntime(2009): at dalvik.system.NativeStart.main(Native Method)

打了断点看了一下数值都是大于0的，一开始以为bitmap的获取方法不对，换了也一样出错。功夫不负有心人，最后找到解决办法的灵感来自这个网站4楼的回答http://bbs.csdn.net/topics/370255160。自己的猜测：Bitmap的getWidth和getHeight方法返回的是int类型，而Matrix的setScale方法需要的是float类型，所以如果分子小于分母就会得到0，就会报错。检验猜测：把int类型转换为float类型，matrix.setScale(1.0f * width / bitmap.getWidth(), 1.0f * height/ bitmap.getHeight());问题终于解决了。如果有错恳请大神指导。

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