Android:使用按钮放大ImageView(无MotionEvent)

在TouchImageView类中添加这两个方法

public void zoomIn() { //bind on zoomIn Button
    oldScale = saveScale;
    if(saveScale<=maxScale)
    {
        saveScale += .5;
        matrix.setScale(saveScale, saveScale);
        setImageMatrix(matrix);
        invalidate();
        // Center the image
        // Center the image
        if(bmHeight>bmWidth)
        {
        redundantXSpace = width - (saveScale * bmWidth);
        redundantXSpace /= 2;
        }
        else 
        {
            redundantYSpace = height - (saveScale * bmHeight) ;
            redundantYSpace /= 2;
        }
        matrix.postTranslate(redundantXSpace , redundantYSpace );
        setImageMatrix(matrix);
        invalidate();
    }
}
public void zoomOut() { 

 //Bind on zoom Out Button
    if(saveScale>=minScale)
    {
        saveScale -= .5;
        matrix.setScale(saveScale, saveScale);
        setImageMatrix(matrix);
        invalidate();
        // Center the image
        if(bmHeight>bmWidth)
        {
        redundantXSpace = width - (saveScale * bmWidth);
        redundantXSpace /= 2;
        }
        else 
        {
            redundantYSpace = height - (saveScale * bmHeight) ;
            redundantYSpace /= 2;
        }
        matrix.postTranslate(redundantXSpace , redundantYSpace );
        setImageMatrix(matrix);
        invalidate();
    }
}

单击按钮protected void onCreate(Bundle savedInstanceState({super.onCreate(savedInstanceState(；

setContentView(R.layout.LAYOUT_NAME);
Button zoonIn = (Button)findViewById(R.id.ZOOM_IN_BUTTON_ID);
Button zoonOut = (Button)findViewById(R.id.ZOOM_OUT_BUTTON_ID);
final TouchImageView touch = (TouchImageView)findViewById(R.id.YOUR_TOUCH_IMAGE_VIEW_)ID);
Bitmap bImage = BitmapFactory.decodeResource(this.getResources(), R.drawable.DRAWABLE_ID);
touch.setImageBitmap(bImage);
touch.setMaxZoom(4f); //change the max level of zoom, default is 3f

zoonIn.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        touch.zoomIn();
    }
});

zoonOut.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        touch.zoomOut();
    }
});
}

您可以用XML创建动画，如：

/res/anim/zoomin.xml：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:fillEnabled="true"
    android:fillAfter="true">
    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="2000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.5"
        android:fillEnabled="true"
        android:fillAfter="true"
        android:toYScale="1.5" >
    </scale>
</set>

和另一个类似的：

/res/anim/zoomout.xml：

<?xml version="1.0" encoding="utf-8"?>
<set
    android:fillEnabled="true"
    android:fillAfter="true"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="2000"
        android:fromXScale="1.5"
        android:fromYScale="1.5"
        android:pivotX="50%"
        android:pivotY="50%"
        android:fillEnabled="true"
        android:fillAfter="true"
        android:toXScale="1"
        android:toYScale="1" >
    </scale>
</set>

在您的onCreate:中

Animation zoomin= AnimationUtils.loadAnimation(this, R.anim.zoomin);
Animation zoomout= AnimationUtils.loadAnimation(this, R.anim.zoomout);

点击ClickListener:上的按钮

myImageView.startAnimation(zoomin);

希望能有所帮助。