public Bitmap getResizedBitmap(Bitmap bm, int newWidth) {
int newHeight;
int width = bm.getWidth();
int height = bm.getHeight();
double aspect_ratio = width/height;
newHeight = (int) (newWidth*aspect_ratio);
if(iv!=null){
ViewGroup.LayoutParams params = iv.getLayoutParams();
params.height = newHeight;
iv.setLayoutParams(params);
}
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
matrix, false);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
resizedBitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
Log.e(TAG, "getResizedBitmap: bse64" + getBase64(resizedBitmap) );
return resizedBitmap;
}
在这里,我正在转换位图以缩减它 . 但在png位图应用程序崩溃 . 如果我选择jpg文件,但选择png文件应用程序崩溃,它可以正常工作 . 得到了这个错误
致命异常:主要进程:app.com.imageuploadexample,PID:6984 java.lang.IllegalArgumentException:android.graphics.Bitmap上android.graphics.Bitmap.createBitmap(Bitmap.java:841)的宽度和高度必须> 0 . 位于app.com.imageuploadexample.MainActivity.getResizedBitmap(MainActivity.java:108)的android.graphics.Bitmap.createBitmap(Bitmap.java:751)的createBitmap(Bitmap.java:820)位于app.com.imageuploadexample.MainActivity $ 1 . 运行(MainActivity.java:75)android.os.Handler.handleCallback(Handler.java:815)android.os.Handler.dispatchMessage(Handler.java:104)android.os.Looper.loop(Looper.java) :238)在android.app.ActivityThread.main(ActivityThread.java:6016)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java) :937)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:798)
1 回答
你可以尝试下面的代码来解决你的问题
公共类BitmapConvert扩展AppCompatActivity {Bitmap bmp;
}