利用ImageView和SeekBar动态缩放和旋转图片的Demo

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context="${relativePackage}.${activityClass}" >

    <ImageView

        android:id="@+id/image_view"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:scaleType="fitCenter"

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

    <TextView

        android:id="@+id/textview1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp" />

    <SeekBar

        android:id="@+id/seekbar1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <TextView

        android:id="@+id/textview2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp"

        android:text="旋转度数:0" />

    <SeekBar

        android:id="@+id/seekbar2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" 

        android:max="360"/>

</LinearLayout>

结合屏幕与SeekBar获取缩放：DisplayMetrics mDisplayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
mSeekBar1.setMax(mDisplayMetrics.widthPixels - MIN_WIDTH);

改变seekbar的图片响应代码：if (seekBar.getId() == R.id.seekbar1)
{
int newwidth = progress + MIN_WIDTH;
int newheight = (int) (progress * 3 / 4);
mImageView.setLayoutParams(new LinearLayout.LayoutParams(newwidth, newheight));
mTextView1.setText(getResources().getString(R.string.image_width) + progress + " ");
} else if (seekBar.getId() == R.id.seekbar2)
{
Bitmap bitmap = ((BitmapDrawable) getResources().getDraw
4000
able(R.drawable.android_l)).getBitmap();
Matrix matrix = new Matrix();
matrix.setRotate(progress);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
mImageView.setImageBitmap(bitmap);
mTextView2.setText(getResources().getString(R.string.rotate) + progress);
}

总代码：package com.example.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.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 ImageView mImageView;
private TextView mTextView1, mTextView2;
private SeekBar mSeekBar1, mSeekBar2;
private final static int MIN_WIDTH = 200;

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setControl();
setScreenMaxSeekBAr1();
SetonChangSeekBar();
}

public void setControl()
{
mImageView = (ImageView) findViewById(R.id.image_view);
mSeekBar1 = (SeekBar) findViewById(R.id.seekbar1);
mSeekBar2 = (SeekBar) findViewById(R.id.seekbar2);
mTextView1 = (TextView) findViewById(R.id.textview1);
mTextView2 = (TextView) findViewById(R.id.textview2);
}

public void SetonChangSeekBar()
{
mSeekBar1.setOnSeekBarChangeListener(this);
mSeekBar2.setOnSeekBarChangeListener(this);
}

private void setScreenMaxSeekBAr1()
{
DisplayMetrics mDisplayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
mSeekBar1.setMax(mDisplayMetrics.widthPixels - MIN_WIDTH);
}

@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
if (seekBar.getId() == R.id.seekbar1)
{
int newwidth = progress + MIN_WIDTH;
int newheight = (int) (progress * 3 / 4);
mImageView.setLayoutParams(new LinearLayout.LayoutParams(newwidth, newheight));
mTextView1.setText(getResources().getString(R.string.image_width) + progress + " ");
} else if (seekBar.getId() == R.id.seekbar2)
{
Bitmap bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.android_l)).getBitmap();
Matrix matrix = new Matrix();
matrix.setRotate(progress);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
mImageView.setImageBitmap(bitmap);
mTextView2.setText(getResources().getString(R.string.rotate) + progress);
}

}

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

}

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

}

}只是自己的小程序。