监听SD卡状态

 最近在做项目时遇到需要处理SD卡拔出时的监听，在网上找了很多资料。总结了一下，

用接收广播处理最有效率

    sd卡拔插时会发送广播，具体如下（摘自一位大虾的博客  来自：http://blog.csdn.net/giantgreen/article/details/41991291）：

  外部存储设备的状态变化时发出的广播

对比不同状态下的广播

1. 插入外部SD卡时：

 

 

 

2. 移除外部SD卡时：

 

 

 

 

3. 连接PC进入USB大容量存储模式时：

 

 

4. 连接PC退出USB大容量存储模式时：

 

 

 

 

代码实现监听

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<strong>    public void startListen()      {          IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);          intentFilter.setPriority(1000);            intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);          intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);          intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);          intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);           intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);          intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);           intentFilter.addAction(Intent.ACTION_MEDIA_CHECKING);          intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);          intentFilter.addAction(Intent.ACTION_MEDIA_NOFS);          intentFilter.addAction(Intent.ACTION_MEDIA_BUTTON);          intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);          intentFilter.addDataScheme("file");          registerReceiver(broadcastRec, intentFilter);      }              private final BroadcastReceiver broadcastRec = new BroadcastReceiver() {            @Override            public void onReceive(Context context, Intent intent) {                String action = intent.getAction();               Log.d("MediaAction", action);              if (action.equals("android.intent.action.MEDIA_MOUNTED"))              {                    //todo              } else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED))               {                    //todo              }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)){              }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)){              }else if (action.equals(Intent.ACTION_MEDIA_SHARED)){              }else {               }            }        };   </strong>

 

用接收广播处理SD卡拔插有两种情况：

1）整个程序都需要响应这一事件

在清单中注册静态广播

 intentFilter.setPriority(1000);// 设置最高优先级    

1. <receiver android:name=".StaticBroadcastReceiver">  
2.             <intent-filter>  
3.                 <action android:name="android.intent.action.BOOT_COMPLETED" />  
4.                 <category android:name="android.intent.category.HOME" />  
5.             </intent-filter>  
6.   
7.             <intent-filter>  
8.                 <action android:name="android.intent.action.MEDIA_MOUNTED"/>  
9.                 <action android:name="android.intent.action.MEDIA_UNMOUNTED"/>  
10.                 <category android:name="android.intent.category.DEFAULT" />  
11.                 <data android:scheme="file" />  
12.             </intent-filter>  
13.   
14.   
15.             <intent-filter>  
16.                 <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />  
17.         <action android:name="android.intent.action.USER_PRESENT" />  
18.             </intent-filter>  
19. </receiver>  

   

1. public class StaticBroadcastReceiver extends BroadcastReceiver {  
2.   
3.     @Override  
4.     public void onReceive(Context context, Intent intent) {  
5.         // TODO Auto-generated method stub  
6.         if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){  
7.             Log.d(TAG, "onReceive boot: ");   
8.             Intent new_intent = new Intent(context,TestLauncher.class);  
9.             //popup the activity  
10.             new_intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
11.             context.startActivity(new_intent);  
12.         }else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {  
13.             Log.d(TAG, "onReceive ACTION_USER_PRESENT: ");  
14.         }  
15.     }  
16.   
17. }  

 2）只有某个activity需要响应：

在代码中注册动态广播

1.注册广播

[java] view plaincopy

1. // 在IntentFilter中选择你要监听的行为    
2.         IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);// sd卡被插入，且已经挂载    
3.         intentFilter.setPriority(1000);// 设置最高优先级    
4.         intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);// sd卡存在，但还没有挂载    
5.         intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);// sd卡被移除    
6.         intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);// sd卡作为 USB大容量存储被共享，挂载被解除    
7.         intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);// sd卡已经从sd卡插槽拔出，但是挂载点还没解除    
8.         intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);// 开始扫描    
9.         intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);// 扫描完成    
10.         intentFilter.addDataScheme("file");    
11.         registerReceiver(broadcastRec, intentFilter);// 注册监听函数    

2.接收广播事件处理

[java] view plaincopy

1. private final BroadcastReceiver broadcastRec = new BroadcastReceiver() {    
2.         @Override    
3.         public void onReceive(Context context, Intent intent) {    
4.             String action = intent.getAction();    
5.             if (action.equals("android.intent.action.MEDIA_MOUNTED"))// SD    
6.             // 卡已经成功挂载    
7.             {    
8.                 imagepath = android.os.Environment.getExternalStorageDirectory();// 你的SD卡路径    
9.                 Toast.makeText(MyService.this, "我的卡已经成功挂载", 0).show();    
10.             } else if (action.equals("android.intent.action.MEDIA_REMOVED")// 各种未挂载状态    
11.                     || action.equals("android.intent.action.ACTION_MEDIA_UNMOUNTED")    
12.                     || action.equals("android.intent.action.ACTION_MEDIA_BAD_REMOVAL")) {    
13.                 imagepath = android.os.Environment.getDataDirectory();// 你的本地路径    
14.                 Toast.makeText(MyService.this, "我的各种未挂载状态", 0).show();    
15.             }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)){//开始扫描    
16.                 Toast.makeText(MyService.this, "开始扫描...", 0).show();    
17.             }else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)){//扫描完成    
18.                 Toast.makeText(MyService.this, "扫描完成...", 0).show();    
19.             }else if (action.equals(Intent.ACTION_MEDIA_SHARED)){//扩展介质的挂载被解除 (unmount)。因为它已经作为 USB 大容量存储被共享    
20.                 Toast.makeText(MyService.this, " USB 大容量存储被共享...", 0).show();    
21.             }else {    
22.                 Toast.makeText(MyService.this, "其他状态...", 0).show();    
23.             }    
24.             Log.i(TAG, "imagepath---" + imagepath);    
25.         }    
26.     };   

3.取消注册

[java] view plaincopy

1. unregisterReceiver(broadcastRec);//取消注册   

 

4.需要在AndroidManifest.xml中添加操作SDCard的权限

 

1.<!-- 在SDCard中创建与删除文件权限 -->    
2. <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />    
3. <!-- 往SDCard写入数据权限 -->    
4.<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />