android 图片的自由缩放和旋转

 

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

    <ImageView android:id="@+id/imageview"
        android:layout_width="200dp"
        android:layout_height="150dp"
        android:src="@drawable/android1"
        android:scaleType="fitCenter" />
    <TextView android:id="@+id/textview1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="图像宽度：240 图像高度：160"/>
	<SeekBar android:id="@+id/seekbar1"
	    android:layout_width="200dp"
	    android:layout_height="20dp"
	    android:layout_margin="10dp"
	    android:max="240"
	    android:progress="120"/>
	<TextView android:id="@+id/textview2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="0度"/>
	<SeekBar android:id="@+id/seekbar2"
	    android:layout_width="200dp"
	    android:layout_height="20dp"
	    android:layout_margin="10dp"
	    android:max="360"/>
</LinearLayout>

 

package com.android.imageview;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class Main extends Activity implements OnSeekBarChangeListener{
    private int minWidth = 80;
    private ImageView imageview;
    private TextView textView1,textView2;
    private Matrix matrix = new Matrix();//构建一个3*3的矩阵
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imageview = (ImageView)this.findViewById(R.id.imageview);
        SeekBar seekBar1 = (SeekBar)this.findViewById(R.id.seekbar1);
        SeekBar seekBar2 = (SeekBar)this.findViewById(R.id.seekbar2);
        textView1=(TextView)this.findViewById(R.id.textview1);
        textView2=(TextView)this.findViewById(R.id.textview2);
        seekBar1.setOnSeekBarChangeListener(this);
        seekBar2.setOnSeekBarChangeListener(this);
        
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        seekBar1.setMax(dm.widthPixels-minWidth);
    }

	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		// TODO Auto-generated method stub
		if(seekBar.getId()==R.id.seekbar1){
			//progress是seekBar的进度，拉伸进度，加minWidth是宽度，为了按比例缩放，所以高度是宽度的四分之三
			int newWidth = progress+minWidth;
			int newHight = (int)(newWidth*3/4);
			imageview.setLayoutParams(new LinearLayout.LayoutParams(newWidth, newHight));
			textView1.setText("图像的宽度："+newWidth+" 图像的高度"+newHight);
		}else if(seekBar.getId()==R.id.seekbar2){
			Bitmap bitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.android1)).getBitmap();
			matrix.setRotate(progress);//设置翻转的角度
			bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(),matrix , true);//重做位图
			imageview.setImageBitmap(bitmap);//将位图添加到imageview里面
			textView2.setText(progress+"度");
		}
	}

	public void onStartTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub
		
	}

	public void onStopTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub
		
	}
}