通过设置Bitmap旋转ImageView(动态旋转图片)

java:

package EX04_25.txt;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.LinearLayout;public class EX04_25 extends Activity {private Button LButton;private Button RButton;private ImageView mImageView;private int degrean = 0;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                initApp();    }private void initApp() {LButton = (Button)findViewById(R.id.leftButton);RButton = (Button)findViewById(R.id.rightButton);mImageView = (ImageView)findViewById(R.id.myImage);final Bitmap bmp= BitmapFactory.decodeResource(getResources(), R.drawable.woman);final int mWidth = bmp.getWidth();final int mHeight = bmp.getHeight();mImageView.setScaleType(ScaleType.CENTER); //这项设置为正常旋转Bitmap的关键// TODO Auto-generated method stubLButton.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubturnLeft();}private void turnLeft() {// TODO Auto-generated method stubdegrean--;if (degrean < -5) {degrean = -5;}Matrix mt = new Matrix();mt.postRotate(5*degrean);Bitmap turnBmp = Bitmap.createBitmap(bmp, 0, 0, mWidth, mHeight, mt, true);mImageView.setImageBitmap(turnBmp);}});RButton.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubturnRight();}private void turnRight() {// TODO Auto-generated method stubdegrean++;if (degrean > 5) {degrean = 5;}Matrix mt = new Matrix();mt.postScale(1, 1);mt.setRotate(5*degrean);Bitmap turnBmp = Bitmap.createBitmap(bmp, 0, 0, mWidth, mHeight, mt, true);BitmapDrawable turnDrawable = new BitmapDrawable(turnBmp);mImageView.setImageDrawable(turnDrawable);}});}}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><Buttonandroid:id = "@+id/leftButton"android:layout_marginTop = "40dip" android:layout_marginLeft = "20dip"     android:layout_width="81dip"     android:layout_height="wrap_content"     android:text="向左旋转"    /><ImageViewandroid:id = "@+id/myImage"android:layout_marginTop = "10dip" android:layout_marginLeft = "10dip"     android:layout_width="100dip"     android:layout_height="125dip"     android:src = "@drawable/woman"    />    <Buttonandroid:id = "@+id/rightButton"android:layout_marginTop = "40dip" android:layout_marginLeft = "10dip"     android:layout_width="80dip"     android:layout_height="wrap_content"     android:text="向右旋转"    />        </LinearLayout>