android 实现图片的旋转 - 翛莜的日志 - 网易博客

public class ex04_22 extends Activity{
  
 private ImageView mImageView;
 private Button btn1,btn2;
 private TextView mTextView;
 private AbsoluteLayout layout1;
 private int ScaleTimes=1,ScaleAngle=1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mImageView=(ImageView)findViewById(R.id.myImageView);
        final Bitmap bmp=BitmapFactory.decodeResource(this.getResources(),R.drawable.ex04_22_1);
        final int widthOrig=bmp.getWidth();
        final int heightOrig=bmp.getHeight();
        mImageView.setImageBitmap(bmp);
        btn1=(Button)findViewById(R.id.myButton1);
        btn1.setOnClickListener(new OnClickListener(){
         public void onClick(View v){
          ScaleAngle--;
          if(ScaleAngle<-60){
           ScaleAngle=-60;
          }
          int newWidth=widthOrig*ScaleTimes;
          int newHeight=heightOrig*ScaleTimes;
          float scaleWidth=((float)newWidth)/widthOrig;
          float scaleHeight=((float)newHeight)/heightOrig;
          Matrix matrix=new Matrix();
          matrix.postScale(scaleWidth, scaleHeight);
          matrix.setRotate(5*ScaleAngle);
          Bitmap resizeBitmap=Bitmap.createBitmap(bmp, 0, 0, widthOrig, heightOrig, matrix, true);
          BitmapDrawable myNewBitmapDrawable=new BitmapDrawable(resizeBitmap);
          mImageView.setImageDrawable(myNewBitmapDrawable);
         }
        });
        btn2=(Button)findViewById(R.id.myButton2);
        btn2.setOnClickListener(new OnClickListener(){
         public void onClick(View v){
          ScaleAngle++;
          if(ScaleAngle>60){
           ScaleAngle=60;
          }
          int newWidth=widthOrig*ScaleTimes;
          int newHeight=heightOrig*ScaleTimes;
          float scaleWidth=((float)newWidth)/widthOrig;
          float scaleHeight=((float)newHeight)/heightOrig;
          Matrix matrix=new Matrix();
          matrix.postScale(scaleWidth, scaleHeight);
          matrix.setRotate(5*ScaleAngle);
          Bitmap resizeBitmap=Bitmap.createBitmap(bmp, 0, 0, widthOrig, heightOrig, matrix, true);
          BitmapDrawable myNewBitmapDrawable=new BitmapDrawable(resizeBitmap);
          mImageView.setImageDrawable(myNewBitmapDrawable);
         }
        });
    }