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);       }  }  }