android相册裁剪 Android开发从相机或相册获取图片裁剪

package com.only.android.app;
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.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.SystemClock;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import com.only.android.R;
public class CopyOfImageScaleActivity extends Activity implements View.OnClickListener {
 /** Called when the activity is first created. */
 private Button selectImageBtn;
 private ImageView imageView;
 private File sdcardTempFile;
 private AlertDialog dialog;
 private int crop = 180;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.imagescale);
  selectImageBtn = (Button) findViewById(R.id.selectImageBtn);
  imageView = (ImageView) findViewById(R.id.imageView);
  selectImageBtn.setOnClickListener(this);
  sdcardTempFile = new File("/mnt/sdcard/", "tmp_pic_" + SystemClock.currentThreadTimeMillis() + ".jpg");
 }
 @Override
 public void onClick(View v) {
  if (v == selectImageBtn) {
   if (dialog == null) {
    dialog = new AlertDialog.Builder(this).setItems(new String[] { "相机", "相册" }, new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
      if (which == 0) {
       Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
       intent.putExtra("output", Uri.fromFile(sdcardTempFile));
       intent.putExtra("crop", "true");
       intent.putExtra("aspectX", 1);// 裁剪框比例
       intent.putExtra("aspectY", 1);
       intent.putExtra("outputX", crop);// 输出图片大小
       intent.putExtra("outputY", crop);
       startActivityForResult(intent, 101);
      } else {
       Intent intent = new Intent("android.intent.action.PICK");
       intent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, "image/*");
       intent.putExtra("output", Uri.fromFile(sdcardTempFile));
       intent.putExtra("crop", "true");
       intent.putExtra("aspectX", 1);// 裁剪框比例
       intent.putExtra("aspectY", 1);
       intent.putExtra("outputX", crop);// 输出图片大小
       intent.putExtra("outputY", crop);
       startActivityForResult(intent, 100);
      }
     }
    }).create();
   }
   if (!dialog.isShowing()) {
    dialog.show();
   }
  }
 }
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  if (resultCode == RESULT_OK) {
   Bitmap bmp = BitmapFactory.decodeFile(sdcardTempFile.getAbsolutePath());
   imageView.setImageBitmap(bmp);
  }
 }
}