android图片的缩放和旋转功能

注意：这个程序本人亲自测试运行过的，完美实现了图片缩放和旋转的效果，seekBar1是用来图片缩放的 seekBar2是图片旋转的，image是图片资源文件，可以自己设置

文件一：MainActivity.java

package com.example.zmap;

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.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

public class MainActivity extends Activity implements OnSeekBarChangeListener {

private int minWidth = 80;

private ImageView image;

private TextView text;

private TextView text2;

private Matrix matrix = new Matrix();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

image = (ImageView) findViewById(R.id.image);

SeekBar seekBar1 = (SeekBar) this.findViewById(R.id.seekbar);

SeekBar seekBar2 = (SeekBar) this.findViewById(R.id.seekbar2);

text = (TextView) this.findViewById(R.id.text);

text2 = (TextView) this.findViewById(R.id.text2);

seekBar1.setOnSeekBarChangeListener(this);

seekBar2.setOnSeekBarChangeListener(this);

DisplayMetrics dm = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(dm);

seekBar1.setMax(dm.widthPixels - minWidth);

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

// TODO Auto-generated method stub

if (seekBar.getId() == R.id.seekbar) {

int newWidth = progress + minWidth;

int newHeight = (int) (newWidth * 3 / 4);

image.setLayoutParams(new LinearLayout.LayoutParams(newWidth,

newHeight));

text.setText("图像高度: " + newWidth + "图像宽度" + newHeight);

} else if (seekBar.getId() == R.id.seekbar2) {

Bitmap bitmap = ((BitmapDrawable) (getResources()

.getDrawable(R.drawable.gougou))).getBitmap();

matrix.setRotate(progress);

bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),

bitmap.getHeight(), matrix, true);

image.setImageBitmap(bitmap);

text2.setText(progress + "度");

}

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

}

文件二: activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<ImageView

android:id="@+id/image"

android:layout_width="200dp"

android:layout_height="150dp"

android:scaleType="fitCenter"

android:src="@drawable/gougou" />

<TextView

android:id="@+id/text"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:text="图像宽度：240 图像高度：160" />

<SeekBar

android:id="@+id/seekbar"

android:layout_width="200dp"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:max="240"

android:progress="120" />

<TextView

android:id="@+id/text2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:text="0度" />

<SeekBar

android:id="@+id/seekbar2"

android:layout_width="200dp"

android:layout_height="wrap_content"

android:max="360"

android:progress="120" />

</LinearLayout>