android 判断sd的状态，所有文件，剩余空间的大小

public class MainActivity extends AppCompatActivity {

String TAG = MainActivity.class.getCanonicalName();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);

String storageState = Environment.getExternalStorageState();        //sd卡的状态        Log.e(TAG, "onCreate: "+storageState );        Log.e(TAG, "onCreate: "+Environment.MEDIA_MOUNTED );        //判断是否有sd卡        boolean equals = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());        Log.e(TAG, "onCreate: "+equals);        //得到sd卡的路径        String absolutePath = Environment.getExternalStorageDirectory().getAbsolutePath();        Log.e(TAG, "onCreate: "+absolutePath );

//得到内置sd卡内所有的文件        File file = Environment.getExternalStorageDirectory();        File[] files = file.listFiles();        for (int i = 0; i < files.length; i++) {            Log.e(TAG, "onCreate: "+files[i] );        }        long freeSpace = Environment.getExternalStorageDirectory().getFreeSpace();        long usableSpace = Environment.getExternalStorageDirectory().getUsableSpace();        long totalSpace = Environment.getExternalStorageDirectory().getTotalSpace();        Log.e(TAG, "onCreate: 剩余空间大小："+freeSpace/1024/1024+" 可用大小:"+usableSpace/1024/1024+" 总空间大小:"+totalSpace/1024/1024 );

}}

demo下载地址：https://github.com/renjiemei1225/ExtraTest