ImageView显示拍照or本地图片

 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     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.imageview.MainActivity" >
11 
12     <Button   
13         android:layout_width="fill_parent" 
14         android:layout_height="wrap_content"  
15         android:text="选择图片" 
16         android:id="@+id/selectImage" 
17         />    
18     <Button   
19         android:layout_width="fill_parent"  
20         android:layout_height="wrap_content"  
21         android:text="拍照图片" 
22         android:id="@+id/captureImage" 
23         />    
24     <ImageView
25         android:id="@+id/imageView"
26         android:maxHeight="1000dip"
27         android:maxWidth="1000dip"
28         android:layout_width="200dp"
29         android:layout_height="200dp"
30         android:layout_gravity="center_horizontal"
31         android:scaleType="fitCenter" />
32 
33 </LinearLayout>

  1 package com.example.imageview;
  2 
  3 import java.io.ByteArrayOutputStream;
  4 import java.io.File;
  5 import java.io.IOException;
  6 
  7 import android.app.Activity;
  8 import android.app.AlertDialog;
  9 import android.app.AlertDialog.Builder;
 10 import android.app.Dialog;
 11 import android.content.ContentResolver;
 12 import android.content.DialogInterface;
 13 import android.content.Intent;
 14 import android.database.Cursor;
 15 import android.graphics.Bitmap;
 16 import android.graphics.BitmapFactory;
 17 import android.net.Uri;
 18 import android.os.Bundle;
 19 import android.os.Environment;
 20 import android.provider.MediaStore;
 21 import android.util.Log;
 22 import android.view.Menu;
 23 import android.view.MenuItem;
 24 import android.view.View;
 25 import android.view.View.OnClickListener;
 26 import android.widget.Button;
 27 import android.widget.ImageView;
 28 import android.widget.Toast;
 29 
 30 
 31 public class MainActivity extends Activity implements OnClickListener {
 32 
 33     private Button selectImage, uploadImage,captureImage;
 34     private ImageView imageView;
 35     private Bitmap photo = null;
 36     private String picPath = null;
 37     private File file = null;
 38     
 39     @Override
 40     protected void onCreate(Bundle savedInstanceState) {
 41         super.onCreate(savedInstanceState);
 42         setContentView(R.layout.activity_main);
 43         
 44         selectImage = (Button) this.findViewById(R.id.selectImage);
 45         captureImage=(Button) this.findViewById(R.id.captureImage);
 46         selectImage.setOnClickListener(this);
 47         uploadImage.setOnClickListener(this);
 48         captureImage.setOnClickListener(this);
 49         imageView = (ImageView) this.findViewById(R.id.imageView);
 50     }
 51 
 52     @Override
 53     public void onClick(View v) {
 54         // TODO Auto-generated method stub
 55         switch (v.getId()) {
 56             case R.id.selectImage: 
 57                 Intent intent = new Intent();
 58                 intent.setType("image/*");
 59                 intent.setAction(Intent.ACTION_GET_CONTENT);
 60                 startActivityForResult(intent, 1);
 61                 break;
 62             case R.id.captureImage:  //照相后显示图片
 63                 destoryBimap();  
 64                 String state = Environment.getExternalStorageState();  
 65                 if (state.equals(Environment.MEDIA_MOUNTED)) {  
 66                     String saveDir = Environment.getExternalStorageDirectory()  
 67                          + "/temple";  
 68                  File dir = new File(saveDir);  
 69                  if (!dir.exists()) {  
 70                      dir.mkdir();  
 71                  }  
 72                  file = new File(saveDir, "temp.jpg");  
 73                  file.delete();  
 74                  if (!file.exists()) {  
 75                      try {  
 76                          file.createNewFile();  
 77                      } catch (IOException e) {  
 78                          e.printStackTrace();  
 79                          Toast.makeText(this,"创建临时文件失败",Toast.LENGTH_LONG).show();  
 80                          return;  
 81                      }  
 82                  }  
 83                  Intent intents = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
 84                  intents.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));  
 85                  startActivityForResult(intents, 2);  
 86              } else {  
 87                  Toast.makeText(this,"存储卡不存在" , Toast.LENGTH_LONG)  .show();  
 88              }  
 89             break;    
 90         default:
 91             break;
 92         }
 93     }
 94     
 95     private void destoryBimap() 
 96     {    
 97         imageView.setImageBitmap(null);  
 98         if (photo != null && !photo.isRecycled()) {    
 99             photo.recycle();     //回收内存，一定要将 imageView中图片设置成null
100             photo = null;    
101         }    
102     }
103 
104     @Override
105     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
106         if (requestCode ==1) {   
107             if (data != null) {
108                 Uri uri = data.getData();
109                 try { 
110                     String[] pojo = { MediaStore.Images.Media.DATA };
111                     Cursor cursor = getContentResolver().query(uri, pojo, null, null, null);
112                     ContentResolver cr = this.getContentResolver();
113                     int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
114                     cursor.moveToFirst();
115                     String path = cursor.getString(colunm_index);
116 
117                     if (path.endsWith("jpg") || path.endsWith("png")) {
118                         picPath = path;
119                         Log.e("图片路径", picPath);
120                         
121                         //Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
122                         //imageView.setImageBitmap(bitmap);
123                         //Bitmap bitmap = MediaStore.Images.Media.getBitmap(cr, uri);    
124                         
125                         Bitmap bitmap = BitmapFactory.decodeFile(picPath);
126                         imageView.setImageBitmap(bitmap);
127                         Toast.makeText(this, "图片路径"+ picPath, 1000).show();
128                     } 
129                     else {
130                         alert("您选择的不是有效的图片");
131                     }    
132                 } catch (Exception e) {
133                     alert("选择图片错误");
134                 }
135             }
136             else{
137                 alert("data is null");
138             }
139         }
140         else if (requestCode ==2){    //拍照后执行    
141               if (file != null && file.exists()) {  
142                     BitmapFactory.Options options = new BitmapFactory.Options();  
143                     options.inSampleSize = 2;  
144                     photo = BitmapFactory.decodeFile(file.getPath(), options);  
145                     imageView.setImageBitmap(photo);  
146                     //picPath = file.getPath();  
147                 } else {  
148                     alert("拍照错误");
149                 }              
150         }
151             
152         super.onActivityResult(requestCode, resultCode, data);
153     }
154     
155     private void alert(String str) {
156         Dialog dialog = new AlertDialog.Builder(this).setTitle("提示")
157                 .setMessage(str)
158                 .setPositiveButton("确定", new DialogInterface.OnClickListener() {
159                     public void onClick(DialogInterface dialog, int which) {
160                         picPath = null;
161                     }
162                 }).create();
163         dialog.show();
164     }
165 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.imageview"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="16"
 9         android:targetSdkVersion="18" />
10     
11     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
12     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
13 
14     <application
15         android:allowBackup="true"
16         android:icon="@drawable/ic_launcher"
17         android:label="@string/app_name"
18         android:theme="@style/AppTheme" >
19         <activity
20             android:name=".MainActivity"
21             android:label="@string/app_name" >
22             <intent-filter>
23                 <action android:name="android.intent.action.MAIN" />
24 
25                 <category android:name="android.intent.category.LAUNCHER" />
26             </intent-filter>
27         </activity>
28     </application>
29 
30 </manifest>