点击Button使图片旋转一定的角度，效果图如下：
代码项目：
package zhang.bp;
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.TextView;
public class bitmap_Matrix extends Activity {
private Button mButton1;
private Button mButton2;
private TextView mTextView1;
private ImageView mImageView1;
private int ScaleTimes;
private int ScaleAngle;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mButton1 = (Button) findViewById(R.id.button1);
mButton2 = (Button) findViewById(R.id.button2);
mImageView1 = (ImageView) findViewById(R.id.imageView1);
mTextView1 = (TextView) findViewById(R.id.textView1);
ScaleTimes = 1;
ScaleAngle = 1;
final Bitmap mySourBmp = BitmapFactory.decodeResource(getResources(),
R.drawable.icon);
final int widthOrig = mySourBmp.getWidth();
final int heightOrig = mySourBmp.getHeight();
mImageView1.setImageBitmap(mySourBmp);
mButton1.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
ScaleAngle--;
if (ScaleAngle < -5) {
ScaleAngle = -5;
}
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 resizedBitmap = Bitmap.createBitmap(mySourBmp, 0, 0,
widthOrig, heightOrig, matrix, true);
BitmapDrawable myNewBitmapDrawable = new BitmapDrawable(
resizedBitmap);
mImageView1.setImageDrawable(myNewBitmapDrawable);
mTextView1.setText(Integer.toString(5 * ScaleAngle));
}
});
mButton2.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
ScaleAngle++;
if (ScaleAngle < 5) {
ScaleAngle = 5;
}
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 resizedBitmap = Bitmap.createBitmap(mySourBmp, 0, 0,
widthOrig, heightOrig, matrix, true);
BitmapDrawable myNewBitmapDrawable = new BitmapDrawable(
resizedBitmap);
mImageView1.setImageDrawable(myNewBitmapDrawable);
mTextView1.setText(Integer.toString(5 * ScaleAngle));
}
});
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
/>
<TableLayout
android:id="@+id/tableLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
/>
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
/>
</TableRow>
</TableLayout>
</LinearLayout>
