如何在不使用XML的情况下在android中显示Bitmap类对象

Question

我试图显示我在android程序中创建的位图，但是我发现的所有教程都涉及Drawables或XML，以便显示它们。 有人可以告诉我在代码中显示位图所需的步骤吗？

这不是全部代码，仅是大多数，其余与使相机正常工作有关。

class Preview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
private Paint mPaint;
private Drawable bitmap;
private Bitmap currentprev;
private ImageView mImageView;

private Camera.PreviewCallback mPrevCallback = new Camera.PreviewCallback() 
{
        public void onPreviewFrame( byte[] data, Camera Cam ) {
                Log.d("CombineTestActivity", "Preview registered");
                Log.d("CombineTestActivity", "Data length = " 
                        + data.length );
               // currentprev = BitmapFactory.decodeByteArray( data, 0, 
               //       data.length );
               currentprev = BitmapFactory.decodeResource( getResources(),
                   R.drawable.creature00 );
               if( currentprev == null )
                   Log.d("CombineTestActivity", "currentprev is null" );
               if( mImageView == null )
                   Log.d("CombineTestActivity", "mImageView is null" );
        //Code fails here, gives null pointer exception
                mImageView.setImageBitmap( currentprev );
                Log.d("CombineTestActivity", "Preview Finished" );
        }
};

private OnTouchListener mCorkyListener = new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent me) {
                Log.d("CombineTestActivity", "touch registered" );
                mCamera.takePicture( null, null, mPicCallback );
                return false;
        }
};

private Camera.PictureCallback mPicCallback = new Camera.PictureCallback() {
        public void onPictureTaken( byte[] data, Camera mCamera ) {

                Log.d("CombineTestActivity", "picture method run" );
        }
};

Preview(Context context) {
    super(context);

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mImageView = (ImageView)findViewById(R.id.imageview);
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    mPaint = new Paint();
    bitmap = context.getResources().getDrawable(
        R.drawable.creature00);
    if( mImageView == null )
        Log.d("CombineTestActivity", "mImageView is null" );

this.setOnTouchListener( mCorkyListener );

}

Answer 1

您需要使用BitmapFactory来创建Bitmap并将其加载到ImageView 。 像这样：

Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.my_image);
ImageView view = (ImageView)findViewById(R.id.my_image_view);
view.setImageBitmap(image);

Answer 2

Bitmap bm; // some bitmap you have loaded.
ImageView iv; // the image view you want to display the bitmap in

iv.setImageBitmap(bm);