Android实现图片裁剪

MainActivity.java

package com.kale.imagetailor;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private String tag = getClass().getSimpleName();
	private static Uri imageUri;

	Button imageTailorBt;
	ImageView userIV;
	File file;
	FileManager fm;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		viewInit();
		fm = new FileManager();
		try {
			file = fm.creatSDFile("Kale Image", "userImage.jpg");
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}

	/**
	 *每次开启时判断设置什么图片，如果有自定义的图片了，那么就用用户自己的头像
	 */
	private void setUserImage(){
		userIV.setImageResource(R.drawable.ic_launcher);
		//从sd卡中得到图片资源
        String filepath = fm.getFileWholePath();
        Bitmap bm = BitmapFactory.decodeFile(filepath);

        if(bm != null){
        	//BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
        	userIV.setImageDrawable(new BitmapDrawable(bm));
        }
        else{
        	userIV.setImageResource(R.drawable.ic_launcher);
        }
	}

	private void viewInit(){
		userIV = (ImageView)findViewById(R.id.user_imageView_id);
		imageTailorBt = (Button)findViewById(R.id.image_tailer_button_id);
		imageTailorBt.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// TODO 自动生成的方法存根
				changeUserImage();
			}
		});
	}

	/**
	 *改变用户头像的方法，这里设定一个intent交给activity去处理
	 */
	protected void changeUserImage(){
		Toast.makeText(getApplicationContext(), "更换头像", 0).show();
		imageUri = Uri.parse("file:///sdcard/temp.jpg"); 

		Intent intent = null;
		intent = new Intent(Intent.ACTION_GET_CONTENT, null);
		intent.setType("image/*");// 设置属性，表示获取任意类型的图片
		intent.putExtra("crop", "true");// 设置可以滑动选选择区域的属性,注意这里是字符串"true"
		intent.putExtra("aspectX", 1);// 设置剪切框1:1比例的效果
		intent.putExtra("aspectY", 1);// 设置剪切框1:1比例的效果
		intent.putExtra("outputX", 600);
		intent.putExtra("outputY", 600);
		intent.putExtra("scale", true);
		intent.putExtra("return-data", false);
		intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
		intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
		intent.putExtra("noFaceDetection", false); // no face detection
		startActivityForResult(intent, 1);
	}

	/**
	 * @param uri
	 * @return 一个bitmap对象，用来设置图片
	 */
	private Bitmap decodeUriAsBitmap(Uri uri){
		Bitmap bitmap = null;
		try {
			bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return null;
		}
		return bitmap;
	}

	/**
	 * 用来设置图片，并保持的本地
	 */
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		//不正确的情况下
		if(resultCode != Activity.RESULT_OK){
			Log.e(tag, "requestCode = " + requestCode);
			Log.e(tag, "resultCode = " + resultCode);
			Log.e(tag, "data = " + data);
			return;
		}
		else{
			Log.d(tag, "CHOOSE_A_BIG_PICTURE: data = " + data);
			if(imageUri != null){
				Bitmap photo = decodeUriAsBitmap(imageUri);
				try {
					//保存到本地文件
					File pictureFile = file;
					FileOutputStream fos = new FileOutputStream(pictureFile);
					photo.compress(Bitmap.CompressFormat.JPEG, 100, fos);
			        fos.close();
			        Toast.makeText(this, "设置成功~", 0).show();

				} catch (FileNotFoundException e) {
					e.printStackTrace();
					Toast.makeText(this, "保存路径不存在", 0).show();
				} catch (IOException e) {
					e.printStackTrace();
					Toast.makeText(this, "设置图片失败", 0).show();
				}
			}
		}
		setUserImage();
	}
}

FileManager.java

package com.kale.imagetailor;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.os.Environment;

/**
 * @tips  :
 *  <!-- 读写SD卡的权限 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 * @date  :2014-6-30
 */
public class FileManager {
	private String SD_PATH;
	private String fileName;
	private String dirName;

	public String getSD_PATH() {
		return SD_PATH;
	}
	public FileManager() {
		//得到当前外部存储设备的目录
		SD_PATH = Environment.getExternalStorageDirectory() + "/";
	}
	/**
	 * 在SD卡上创建文件
	 *
	 * @throws IOException
	 */
	public File creatSDFile(String dirName ,String fileName) throws IOException {
		this.fileName = fileName;
		this.dirName = dirName;
		File file = new File(creatSDDir(dirName), fileName);
		return file;
	}

	public String getFileWholePath(){
		return SD_PATH + dirName + "/" + fileName;
	}

	/**
	 * 在SD卡上创建目录
	 *
	 * @param dirName
	 */
	public File creatSDDir(String dirName) {
		File dir = new File(SD_PATH + dirName);
		dir.mkdir();
		return dir;
	}

	/**
	 * 判断SD卡上的文件夹是否存在
	 */
	public boolean isFileExist(String fileName ,String dirName){
		File file = new File(SD_PATH +dirName+"/"+ fileName);
		return file.exists();
	}

	/**
	 * 将一个InputStream里面的数据写入到SD卡中
	 */
	public File saveToSdCard(String dirName,String fileName,InputStream input){
		File file = null;
		OutputStream output = null;
		try{
			//创建目录
			creatSDDir(dirName);
			//建立文件
			file = creatSDFile(dirName ,fileName);
			output = new FileOutputStream(file);
			byte buffer [] = new byte[5 * 1024];
			int count = 0;
			while((count = input.read(buffer)) != -1){
				String str = new String(buffer,0,count);
				//str = new String(str.getBytes("iso-8859-1"),"utf-8");
				System.out.println("---------File Manager----start--------");
				System.out.println(str);
				System.out.println("---------File Manager-----end-------");
				output.write(buffer);
			}
			output.flush();
		}
		catch(Exception e){
			e.printStackTrace();
		}
		finally{
			try{
				output.close();
			}
			catch(Exception e){
				e.printStackTrace();
			}
		}
		return file;
	}

}

main_activity.xml

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

    <Button
        android:id="@+id/image_tailer_button_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="裁剪图片" />

    <ImageView
        android:id="@+id/user_imageView_id"
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_above="@+id/image_tailer_button_id"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="100dp"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

代码：http://download.csdn.net/detail/shark0017/7623057