Android-ImageView顯示選擇本地圖片或拍照

最近寫項目，遇到了，在此記錄一下。Android-ImageView顯示選擇本地圖片或拍照.

1. import java.io.ByteArrayOutputStream;  
2. import java.io.InputStream;  
3. import android.app.Activity;  
4. import android.app.AlertDialog;  
5. import android.content.ContentResolver;  
6. import android.content.DialogInterface;  
7. import android.content.Intent;  
8. import android.database.Cursor;  
9. import android.graphics.Bitmap;  
10. import android.graphics.BitmapFactory;  
11. import android.net.Uri;  
12. import android.os.Bundle;  
13. import android.provider.MediaStore;  
14. import android.view.View;  
15. import android.view.View.OnClickListener;  
16. import android.widget.ImageView;  
17.   
18. public class PicChooserActivity extends Activity {  
19.     /** Called when the activity is first created. */  
20.     private ImageView  imageView;  
21.     private OnClickListener imgViewListener;  
22.     private Bitmap myBitmap;  
23.     private byte[] mContent;  
24.     @Override  
25.     public void onCreate(Bundle savedInstanceState) {  
26.         super.onCreate(savedInstanceState);  
27.         setContentView(R.layout.main);  
28.         imageView  =(ImageView) findViewById(R.id.ivPic);  
29.           
30.         imageView.setOnClickListener(new OnClickListener() {  
31.               
32.             @Override  
33.             public void onClick(View v) {  
34.                 // TODO Auto-generated method stub   
35.                 final CharSequence[] items = { "相冊", "拍照" };  
36.                   
37.                 AlertDialog dlg = new AlertDialog.Builder(PicChooserActivity.this).setTitle("選擇照片").setItems(items,   
38.                         new DialogInterface.OnClickListener() {  
39.                               
40.                             @Override  
41.                             public void onClick(DialogInterface dialog, int which) {  
42.                                 // TODO Auto-generated method stub   
43.                             //這裡item是根據選擇的方式，   在items數組裡面定義了兩種方式，拍照的下標為1所以就調用拍照方法     
44.                                 if(which==1){  
45.                                     Intent getImageByCamera  = new Intent("android.media.action.IMAGE_CAPTURE");  
46.                                     startActivityForResult(getImageByCamera, 1);  
47.                                 }else{  
48.                                     Intent getImage = new Intent(Intent.ACTION_GET_CONTENT);  
49.                                     getImage.addCategory(Intent.CATEGORY_OPENABLE);  
50.                                     getImage.setType("image/jpeg");  
51.                                     startActivityForResult(getImage, 0);  
52.                                 }  
53.                                   
54.                             }  
55.                         }).create();  
56.                 dlg.show();  
57.             }  
58.         });  
59.           
60.     }  
61.       
62.       
63.     @Override  
64.     protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
65.         // TODO Auto-generated method stub   
66.         super.onActivityResult(requestCode, resultCode, data);  
67.           
68.         ContentResolver contentResolver  =getContentResolver();  
69.          /** 
70.          * 因為兩種方式都用到了startActivityForResult方法，這個方法執行完後都會執行onActivityResult方法， 
71.          * 所以為了區別到底選擇了那個方式獲取圖片要進行判斷，這裡的requestCode跟startActivityForResult裡面第二個參數對應 
72.          */  
73.           
74.         if(requestCode==0){  
75.               
76.             //方式一   
77.             /*try { 
78.                  //獲得圖片的uri  
79.                 Uri orginalUri = data.getData(); 
80.                   //將圖片內容解析成字節數組  
81.                 mContent = readStream(contentResolver.openInputStream(Uri.parse(orginalUri.toString()))); 
82.                  //將字節數組轉換為ImageView可調用的Bitmap對象  
83.                 myBitmap  =getPicFromBytes(mContent,null); 
84.                   ////把得到的圖片綁定在控件上顯示 
85.                 imageView.setImageBitmap(myBitmap); 
86.             } catch (Exception e) { 
87.                 e.printStackTrace(); 
88.                 // TODO: handle exception 
89.             }*/  
90.               
91.             //方式二   
92.             try {  
93.                 Uri selectedImage = data.getData();  
94.                 String[] filePathColumn = { MediaStore.Images.Media.DATA };  
95.   
96.                 Cursor cursor = getContentResolver().query(selectedImage,  
97.                         filePathColumn, null, null, null);  
98.                 cursor.moveToFirst();  
99.   
100.                 int columnIndex = cursor.getColumnIndex(filePathColumn[0]);  
101.                 String picturePath = cursor.getString(columnIndex);  
102.                 cursor.close();  
103.                 imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));  
104.             } catch (Exception e) {  
105.                 // TODO: handle exception   
106.                 e.printStackTrace();  
107.             }  
108.               
109.               
110.         }else if(requestCode==1){  
111.             try {  
112.                 Bundle extras = data.getExtras();  
113.                 myBitmap = (Bitmap) extras.get("data");  
114.                 ByteArrayOutputStream baos = new ByteArrayOutputStream();       
115.                 myBitmap.compress(Bitmap.CompressFormat.JPEG , 100, baos);       
116.                 mContent=baos.toByteArray();  
117.             } catch (Exception e) {  
118.                 e.printStackTrace();  
119.                 // TODO: handle exception   
120.             }  
121.             imageView.setImageBitmap(myBitmap);  
122.         }  
123.           
124.     }  
125.       
126.    public static Bitmap getPicFromBytes(byte[] bytes, BitmapFactory.Options opts) {   
127.         if (bytes != null)   
128.             if (opts != null)   
129.                 return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,opts);   
130.             else   
131.                 return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);   
132.         return null;   
133.     }   
134.       
135.       
136.       
137.  public static byte[] readStream(InputStream in) throws Exception{  
138.      byte[] buffer  =new byte[1024];  
139.      int len  =-1;  
140.      ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
141.        
142.      while((len=in.read(buffer))!=-1){  
143.          outStream.write(buffer, 0, len);  
144.      }  
145.      byte[] data  =outStream.toByteArray();  
146.      outStream.close();  
147.      in.close();  
148.      return data;  
149.  }  
150.       
151. }  

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