android 开启本地相册选择图片并返回显示

.java

 package com.jerry.crop;

 import java.io.File;

 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Environment;
 import android.provider.MediaStore;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.Toast;

 public class MainActivity extends Activity {

     private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
     private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
     private static final int PHOTO_REQUEST_CUT = 3;// 结果

     private ImageView iv_image;

     /* 头像名称 */
     private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
     private File tempFile;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         this.iv_image = (ImageView) this.findViewById(R.id.iv_image);
     }

     /*
      * 从相册获取
      */
     public void gallery(View view) {
         // 激活系统图库，选择一张图片
         Intent intent = new Intent(Intent.ACTION_PICK);
         intent.setType("image/*");
         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_GALLERY
         startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
     }

     /*
      * 从相机获取
      */
     public void camera(View view) {
         // 激活相机
         Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
         // 判断存储卡是否可以用，可用进行存储
         if (hasSdcard()) {
             tempFile = new File(Environment.getExternalStorageDirectory(),
                     PHOTO_FILE_NAME);
             // 从文件中创建uri
             Uri uri = Uri.fromFile(tempFile);
             intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
         }
         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
         startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
     }

     /*
      * 剪切图片
      */
     private void crop(Uri uri) {
         // 裁剪图片意图
         Intent intent = new Intent("com.android.camera.action.CROP");
         intent.setDataAndType(uri, "image/*");
         intent.putExtra("crop", "true");
         // 裁剪框的比例，1：1
         intent.putExtra("aspectX", 1);
         intent.putExtra("aspectY", 1);
         // 裁剪后输出图片的尺寸大小
         intent.putExtra("outputX", 250);
         intent.putExtra("outputY", 250);

         intent.putExtra("outputFormat", "JPEG");// 图片格式
         intent.putExtra("noFaceDetection", true);// 取消人脸识别
         intent.putExtra("return-data", true);
         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
         startActivityForResult(intent, PHOTO_REQUEST_CUT);
     }

     /*
      * 判断sdcard是否被挂载
      */
     private boolean hasSdcard() {
         if (Environment.getExternalStorageState().equals(
                 Environment.MEDIA_MOUNTED)) {
             return true;
         } else {
             return false;
         }
     }

     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == PHOTO_REQUEST_GALLERY) {
             // 从相册返回的数据
             if (data != null) {
                 // 得到图片的全路径
                 Uri uri = data.getData();
                 crop(uri);
             }

         } else if (requestCode == PHOTO_REQUEST_CAREMA) {
             // 从相机返回的数据
             if (hasSdcard()) {
                 crop(Uri.fromFile(tempFile));
             } else {
                 Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", 0).show();
             }

         } else if (requestCode == PHOTO_REQUEST_CUT) {
             // 从剪切图片返回的数据
             if (data != null) {
                 Bitmap bitmap = data.getParcelableExtra("data");
                 this.iv_image.setImageBitmap(bitmap);
             }
             try {
                 // 将临时文件删除
                 tempFile.delete();
             } catch (Exception e) {
                 e.printStackTrace();
             }

         }

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

.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context=".MainActivity" >

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="gallery"
         android:text="获取图库图片" />
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="camera"
         android:text="拍照获取图片" />

     <ImageView
         android:id="@+id/iv_image"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />

 </LinearLayout>

效果图：