Android 截取本地图库图片 并显示

package com.example.image;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

public class MainActivity extends Activity {

	private static final int REQUEST_OK=1;	//返回
	private ImageView mImageView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mImageView = (ImageView) findViewById(R.id.iv);
		findViewById(R.id.btn).setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
				intent.setType("image/*");
				intent.putExtra("crop", "true");
				intent.putExtra("aspectX", 1);	//控制横纵比
				intent.putExtra("aspectY", 1);
				intent.putExtra("outputX", 300);	//控制大小    影响截取部分显示的清晰度,值大一些相对来说清晰度高一些.
				intent.putExtra("outputY", 300);
				intent.putExtra("scale", true);
				intent.putExtra("return-data", true);
				intent.putExtra("outputFormat",
						Bitmap.CompressFormat.JPEG.toString());
				intent.putExtra("noFaceDetection", true); // no face detection
				startActivityForResult(intent,REQUEST_OK);
			}
		});
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode == RESULT_OK) {
			if (requestCode == REQUEST_OK) {
				Bundle bundle = data.getExtras();
				Bitmap bitmap = (Bitmap) bundle.get("data");
				mImageView.setImageBitmap(bitmap);
			}
		}
	}

}