android 开启本地相册选择图片并返回显示_移动开发_编程开发_程序员俱乐部

.java

  1 package com.jerry.crop;
  2 
  3 import java.io.File;
  4 
  5 import android.app.Activity;
  6 import android.content.Intent;
  7 import android.graphics.Bitmap;
  8 import android.net.Uri;
  9 import android.os.Bundle;
 10 import android.os.Environment;
 11 import android.provider.MediaStore;
 12 import android.view.View;
 13 import android.widget.ImageView;
 14 import android.widget.Toast;
 15 
 16 public class MainActivity extends Activity {
 17 
 18     private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
 19     private static final int PHOTO_REQUEST_GALLERY = 2;// 从相册中选择
 20     private static final int PHOTO_REQUEST_CUT = 3;// 结果
 21 
 22     private ImageView iv_image;
 23 
 24     /* 头像名称 */
 25     private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
 26     private File tempFile;
 27 
 28     @Override
 29     protected void onCreate(Bundle savedInstanceState) {
 30         super.onCreate(savedInstanceState);
 31         setContentView(R.layout.activity_main);
 32         this.iv_image = (ImageView) this.findViewById(R.id.iv_image);
 33     }
 34 
 35     /*
 36      * 从相册获取
 37      */
 38     public void gallery(View view) {
 39         // 激活系统图库，选择一张图片
 40         Intent intent = new Intent(Intent.ACTION_PICK);
 41         intent.setType("image/*");
 42         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_GALLERY
 43         startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
 44     }
 45 
 46     /*
 47      * 从相机获取
 48      */
 49     public void camera(View view) {
 50         // 激活相机
 51         Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
 52         // 判断存储卡是否可以用，可用进行存储
 53         if (hasSdcard()) {
 54             tempFile = new File(Environment.getExternalStorageDirectory(),
 55                     PHOTO_FILE_NAME);
 56             // 从文件中创建uri
 57             Uri uri = Uri.fromFile(tempFile);
 58             intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
 59         }
 60         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
 61         startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
 62     }
 63 
 64     /*
 65      * 剪切图片
 66      */
 67     private void crop(Uri uri) {
 68         // 裁剪图片意图
 69         Intent intent = new Intent("com.android.camera.action.CROP");
 70         intent.setDataAndType(uri, "image/*");
 71         intent.putExtra("crop", "true");
 72         // 裁剪框的比例，1：1
 73         intent.putExtra("aspectX", 1);
 74         intent.putExtra("aspectY", 1);
 75         // 裁剪后输出图片的尺寸大小
 76         intent.putExtra("outputX", 250);
 77         intent.putExtra("outputY", 250);
 78 
 79         intent.putExtra("outputFormat", "JPEG");// 图片格式
 80         intent.putExtra("noFaceDetection", true);// 取消人脸识别
 81         intent.putExtra("return-data", true);
 82         // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
 83         startActivityForResult(intent, PHOTO_REQUEST_CUT);
 84     }
 85 
 86     /*
 87      * 判断sdcard是否被挂载
 88      */
 89     private boolean hasSdcard() {
 90         if (Environment.getExternalStorageState().equals(
 91                 Environment.MEDIA_MOUNTED)) {
 92             return true;
 93         } else {
 94             return false;
 95         }
 96     }
 97 
 98     @Override
 99     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
100         if (requestCode == PHOTO_REQUEST_GALLERY) {
101             // 从相册返回的数据
102             if (data != null) {
103                 // 得到图片的全路径
104                 Uri uri = data.getData();
105                 crop(uri);
106             }
107 
108         } else if (requestCode == PHOTO_REQUEST_CAREMA) {
109             // 从相机返回的数据
110             if (hasSdcard()) {
111                 crop(Uri.fromFile(tempFile));
112             } else {
113                 Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！", 0).show();
114             }
115 
116         } else if (requestCode == PHOTO_REQUEST_CUT) {
117             // 从剪切图片返回的数据
118             if (data != null) {
119                 Bitmap bitmap = data.getParcelableExtra("data");
120                 this.iv_image.setImageBitmap(bitmap);
121             }
122             try {
123                 // 将临时文件删除
124                 tempFile.delete();
125             } catch (Exception e) {
126                 e.printStackTrace();
127             }
128 
129         }
130 
131         super.onActivityResult(requestCode, resultCode, data);
132     }
133 }

.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     tools:context=".MainActivity" >
 7 
 8     <Button
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:onClick="gallery"
12         android:text="获取图库图片" />
13     <Button
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:onClick="camera"
17         android:text="拍照获取图片" />
18 
19     <ImageView
20         android:id="@+id/iv_image"
21         android:layout_width="wrap_content"
22         android:layout_height="wrap_content" />
23 
24 </LinearLayout>

效果图：