2014-11-8Android学习------Android 实现图片的旋转--------动画Animation学习篇

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/myButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="逆时针"
            android:textSize="18sp" >
        </Button>

        <Button
            android:id="@+id/myButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="顺时针"
            android:textSize="18sp" >
        </Button>
    </LinearLayout>

    <ImageView
        android:id="@+id/myImageView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/a" >
    </ImageView>

</LinearLayout>

import com.wust.imgrotate.R;

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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class DemoActivity extends Activity {

	private ImageView mImageView;
	private Button btn1, btn2;
	private int ScaleTimes = 1, ScaleAngle = 1;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		mImageView = (ImageView) findViewById(R.id.myImageView);
		final Bitmap bmp = BitmapFactory.decodeResource(this.getResources(),
				R.drawable.a);
		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);
			}
		});
	}

}