android 拍照并将图片剪裁、压缩并显示

<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

package com.xiaoqi.camerademo;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.CharacterPickerDialog;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.Date;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn_pics, btn_take;
    private ImageView img;
    private static final String IMAGE_UNSPECIFIED = "image/*";
    private static final int NONE = 0;
    private static final int PHOTO_GRAPH = 1;// 拍照
    private static final int PHOTO_ZOOM = 2; // 缩放
    private static final int PHOTO_RESOULT = 3;// 结果

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_pics = (Button) findViewById(R.id.btn_pics);
        btn_take = (Button) findViewById(R.id.btn_take);
        img = (ImageView) findViewById(R.id.image);
        btn_pics.setOnClickListener(this);
        btn_take.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //选择图库的图片
            case R.id.btn_pics:
                Intent intent1 = new Intent(Intent.ACTION_PICK, null);
                intent1.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_UNSPECIFIED);
                startActivityForResult(intent1, PHOTO_ZOOM);
                break;
            //调用相机拍照
            case R.id.btn_take:
                Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent2.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment
                        .getExternalStorageDirectory(), "temp.jpg")));
                startActivityForResult(intent2, PHOTO_GRAPH);
                break;
        }
    }

    /**
     * 剪裁图片
     *
     * @param uri
     */
    public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
        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", 300);
        intent.putExtra("outputY", 500);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, PHOTO_RESOULT);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == NONE)
            return;
        // 拍照
        if (requestCode == PHOTO_GRAPH) {
            // 设置文件保存路径
            File picture = new File(Environment.getExternalStorageDirectory()
                    + "/temp.jpg");
            startPhotoZoom(Uri.fromFile(picture));
        }

        if (data == null)
            return;

        // 读取相册缩放图片
        if (requestCode == PHOTO_ZOOM) {
            startPhotoZoom(data.getData());
        }
        // 将图片压缩并且显示
        if (requestCode == PHOTO_RESOULT) {

            Bitmap photo = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0-100)压缩文件
            img.setImageBitmap(photo); //把图片显示在ImageView控件上
        }

        super.onActivityResult(requestCode, resultCode, data);
    }
}