1、在AndroidManifest.xml 加入讀取外部儲存器許可權

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

2、註冊動態廣播

public static void register(Context context){
        IntentFilter filter = null;
        filter = new IntentFilter();
        filter.addAction(Intent.ACTION_MEDIA_MOUNTED);   
 
//接收U盤掛載廣播
        filter.addAction(Intent.ACTION_MEDIA_REMOVED);   //接收U盤解除安裝廣播
        filter.addDataScheme("file");
        context.registerReceiver(mSdcardReceiver, filter,"android.permission.READ_EXTERNAL_STORAGE",null);

    }

    static BroadcastReceiver mSdcardReceiver = new BroadcastReceiver(){

        @Override
        
 
public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            if(intent.getAction().equals(Intent.ACTION_MEDIA_MOUNTED)){
                Toast.makeText(context, "path:"+intent.getData().getPath(), Toast.LENGTH_SHORT).show();
            }else if(intent.getAction().equals(Intent.ACTION_MEDIA_REMOVED)){
                Log.i(
 
"ants", "remove ACTION_MEDIA_REMOVED");
            }
        }

    };