Android实现图片区域裁剪功能

package com.xiaoma.piccut.demo; 
 
import java.io.File; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageButton; 
import android.widget.ImageView; 
/** 
 * 调用系统相册或者拍照来实现图片的裁剪、缩放 
 * @author Kiritor 
 **/ 
public class PicCutDemoActivity extends Activity { 
 
 private Button btn = null; 
 /** Called when the activity is first created. */ 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  //初始化 
  init(); 
 } 
  
 /** 
  * 初始化方法实现 
  */ 
 private void init() { 
  btn = (Button) findViewById(R.id.button1); 
  btn.setOnClickListener(new OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    ShowPickDialog(); 
   } 
  }); 
 } 
 
  
 /** 
  * 控件点击事件实现 
  * 
  * 因为有朋友问不同控件的背景图裁剪怎么实现， 
  * 我就在这个地方用了三个控件，只为了自己记录学习 
  * 大家觉得没用的可以跳过啦 
  */ 
  
 
 /** 
  * 选择提示对话框 
  */ 
 private void ShowPickDialog() { 
  new AlertDialog.Builder(this) 
    .setTitle("设置头像...") 
    .setNegativeButton("相册", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      dialog.dismiss(); 
       
      Intent intent = new Intent(Intent.ACTION_PICK, null); 
       
      /** 
       * 下面这句话，与其它方式写是一样的效果，如果： 
       * intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
       * intent.setType(""image/*");设置数据类型 
       * 如果朋友们要限制上传到服务器的图片类型时可以直接写如："image/jpeg 、 image/png等的类型" 
       */ 
      intent.setDataAndType( 
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
        "image/*"); 
      startActivityForResult(intent, 1); 
 
     } 
    }) 
    .setPositiveButton("拍照", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int whichButton) { 
      dialog.dismiss(); 
      Intent intent = new Intent( 
        MediaStore.ACTION_IMAGE_CAPTURE); 
      //下面这句指定调用相机拍照后的照片存储的路径 
      intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri 
        .fromFile(new File(Environment 
          .getExternalStorageDirectory(), 
          "xiaoma.jpg"))); 
      startActivityForResult(intent, 2); 
     } 
    }).show(); 
 } 
 
 @Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
  switch (requestCode) { 
  // 如果是直接从相册获取 
  case 1: 
   startPhotoZoom(data.getData()); 
   break; 
  // 如果是调用相机拍照时 
  case 2: 
   File temp = new File(Environment.getExternalStorageDirectory() 
     + "/test.jpg"); 
   startPhotoZoom(Uri.fromFile(temp)); 
   break; 
  // 取得裁剪后的图片 
  case 3: 
   if(data != null){ 
    setPicToView(data); 
   } 
   break; 
  default: 
   break; 
 
  } 
  super.onActivityResult(requestCode, resultCode, data); 
 } 
  
 /** 
  * 裁剪图片方法实现 
  * @param uri 
  */ 
 public void startPhotoZoom(Uri uri) { 
  Intent intent = new Intent("com.android.camera.action.CROP"); 
  intent.setDataAndType(uri, "image/*"); 
  //下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪 
  intent.putExtra("crop", "true"); 
  // aspectX aspectY 是宽高的比例 
  intent.putExtra("aspectX", 1); 
  intent.putExtra("aspectY", 1); 
  // outputX outputY 是裁剪图片宽高 
  intent.putExtra("outputX", 150); 
  intent.putExtra("outputY", 150); 
  intent.putExtra("return-data", true); 
  startActivityForResult(intent, 3); 
 } 
  
 /** 
  * 保存裁剪之后的图片数据 
  * @param picdata 
  */ 
 private void setPicToView(Intent picdata) { 
  Bundle extras = picdata.getExtras(); 
  if (extras != null) { 
   Bitmap photo = extras.getParcelable("data"); 
   Drawable drawable = new BitmapDrawable(photo); 
    
  } 
 } 
 
}