android监听TF卡插拔事件 判断

  如何通过注册广播获知TF插拔事件：

注册广播：

IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_MEDIA_EJECT);
filter.addAction(Intent.ACTION_MEDIA_MOUNTED);
filter.addDataScheme("file");
this.registerReceiver(usbReceiver, filter);  
filter.addDataScheme("file");
this.registerReceiver(usbReceiver, filter); 

 如何判断TF、USB是否插入以及获取路径：

 通过反射获取类 StorageManager 中的 getVolumePaths 方法获取路径。

private StorageManager mStorageManager;

private static String mInterSD; // 内置sd卡

private static String mExternalSD; // 外置sd卡 1

private static String mUSB; // U盘，外置sd卡2

private String[] mPath;

public void getStorageList() {

    if (mActivity != null) {

        mStorageManager = (StorageManager)             
             mActivity.getSystemService(Activity.STORAGE_SERVICE);

        try {

            mMethodGetPaths = mStorageManager.getClass().getMethod("getVolumePaths");

            mPath = (String[]) mMethodGetPaths.invoke(mStorageManager);

            if (mPath.length > 0) {

                mInterSD= mPath[0];

            }

            if (mPath.length > 1) {

                mExternalSD= mPath[1];

            }

            if (mPath.length > 2) {

                mUSB= mPath[2];

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

public boolean getExternalStorageState() {

    if(TextUtils.isEmpty(EXTERNAL_STORAGE_DIRECTORY)) {

        return false;

    }

    try {

        return "mounted".equals(Environment.getStorageState(new File(mExternalSD)));

    } catch (Exception rex) {

        return false;

    }

}