动态缩放图片（java文件中布局控件（出现ImageView左上角位置改变的问题））

Java：

package EX04_23.txt;import android.R.integer;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.os.Bundle;import android.test.suitebuilder.annotation.SmallTest;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.AbsoluteLayout;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class EX04_23 extends Activity {private ImageView mImageView;private Button mButton1;private Button mButton2;private Bitmap bmp;private LinearLayout layout;private LinearLayout layout1;private int displayWidth;private int displayHeight;private float scaleWidh = 1;private float scaleHeight = 1;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                initApp();    }private void initApp() {// TODO Auto-generated method stubmImageView = (ImageView)findViewById(R.id.myImage);mButton1 = (Button)findViewById(R.id.myButton1);mButton2 = (Button)findViewById(R.id.myButton2);layout = (LinearLayout)findViewById(R.id.myLayout);layout1 = (LinearLayout)findViewById(R.id.myLayout1);DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);displayHeight = dm.heightPixels - 80;displayWidth = dm.widthPixels;bmp = BitmapFactory.decodeResource(getResources(), R.drawable.sun);mButton1.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubsmall();}private void small() {// TODO Auto-generated method stubint width = bmp.getWidth();int height = bmp.getHeight();double scale = 0.8;scaleHeight = (float)(scaleHeight*scale);scaleWidh = (float)(scaleWidh*scale);Matrix mt = new Matrix();mt.postScale(scaleWidh, scaleHeight);Bitmap resizeBmp = Bitmap.createBitmap(bmp, 0, 0, width, height, mt, true);layout.removeAllViews();ImageView imageView = new ImageView(EX04_23.this);imageView.setImageBitmap(resizeBmp);layout.addView(imageView);layout.addView(layout1);setContentView(layout);mButton2.setEnabled(true);}});mButton2.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stubbig();}private void big() {// TODO Auto-generated method stubint height = bmp.getHeight();int width = bmp.getWidth();double scale = 1.2;scaleWidh = (float)(scaleWidh*scale);scaleHeight = (float)(scaleHeight*scale);Matrix mt = new Matrix();mt.postScale(scaleWidh, scaleHeight);Bitmap resizeBmp = Bitmap.createBitmap(bmp, 0, 0, width, height, mt, true);layout.removeAllViews();ImageView bigView = new ImageView(EX04_23.this);bigView.setImageBitmap(resizeBmp);layout.addView(bigView);layout.addView(layout1);setContentView(layout);if (displayHeight<height*scaleHeight*1.2 | displayWidth<width*scaleWidh*1.2) {mButton2.setEnabled(false);}}});}}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id = "@+id/myLayout"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ImageViewandroid:id = "@+id/myImage"android:layout_width="150dip"    android:layout_height="150dip"    android:background = "@drawable/sun"/>    <LinearLayoutandroid:id = "@+id/myLayout1"     android:orientation="horizontal"    android:gravity = "bottom"    android:layout_width="wrap_content"    android:layout_height="fill_parent"    > <Buttonandroid:id = "@+id/myButton1"android:layout_marginLeft = "40dip" android:layout_width="80dip"    android:layout_height="wrap_content"    android:text = "缩小"     /> <Buttonandroid:id = "@+id/myButton2"android:layout_marginLeft = "80dip" android:layout_width="80dip"    android:layout_height="wrap_content"    android:text = "放大"     />        </LinearLayout></LinearLayout>