Question

如何解决当我尝试在调用相机活动时使用Intent.putExtra()时发生的空指针异常。

public class ImageCaptureActivity extends Activity { 

/** Called when the activity is first created. */ 

@Override 

public void onCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Uri mImageCaptureUri = Uri.fromFile(new File("/sdcard/gift2.JPG"));

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
startActivityForResult(intent, 0);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {    
if (requestCode == 0 && resultCode == Activity.RESULT_OK) {  <br>             Toast.makeText(getBaseContext(), "ImageCaptured",Toast.LENGTH_LONG).show();      
Uri chosenImageUri = data.getData();     
Bitmap mBitmap = null;     
try {    
mBitmap = Media.getBitmap(this.getContentResolver(),chosenImageUri);    
} catch (FileNotFoundException e) {     
// TODO Auto-generated catch block 
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}     
ImageView img = new ImageView(this);           
img.setImageBitmap(mBitmap);    
setContentView(img);   
}   
}   
}

当我执行这个课程时。通过相机捕获图像并单击“确定”后，我在语句

处获得空指针异常

"Uri chosenImageUri = data.getData();“

Answer 1

相机应用程序无法在2.2版本的模拟器中运行。尝试使用2.1或更低版本。工作正常。

Answer 2

在图像视图上设置之前调整图像大小解决问题....

public Bitmap getResizedBitmap（Bitmap bm，int newHeight，int newWidth）{

int width = bm.getWidth();

int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;

float scaleHeight = ((float) newHeight) / height;

Matrix matrix = new Matrix();`enter code here`
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);

// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
        matrix, false);

return resizedBitmap;

}

如何在Android中的相机捕获期间解决空指针异常

2 个答案: