android 下拖动seekbar调整图像大小

【实例简介】 android seekbar实例 实现了拖动seekbar以调整图像大小功能
【实例截图】

【核心代码】
前端代码：

<?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:layout_width="fill_parent" android:id="@ id/text1"
		android:layout_height="wrap_content" />
	<ImageView android:id="@ id/image1" android:layout_width="50px"
		android:layout_height="50px" android:scaleType="fitXY" android:src="@drawable/test" />
	<SeekBar android:layout_width="fill_parent" android:id="@ id/bar1"
		android:layout_height="wrap_content" android:max="100"
		android:progress="20" />
</LinearLayout>

后端代码：

package com.test;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener {
	android.widget.TextView text;
	android.widget.ImageView image;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		text = (android.widget.TextView) this.findViewById(R.id.text1);
		image = (android.widget.ImageView) this.findViewById(R.id.image1);
		android.widget.SeekBar bar = (android.widget.SeekBar) this
				.findViewById(R.id.bar1);
		bar.setOnSeekBarChangeListener(this);
	}

	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		text.setText(progress   "");
		image.setLayoutParams(new android.widget.LinearLayout.LayoutParams(
				50   progress, 50   progress));
	}

	public void onStartTrackingTouch(SeekBar seekBar) {
		text.setText("start");

	}

	public void onStopTrackingTouch(SeekBar seekBar) {
		text.setText("stop");
	}
}