public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private TextView mTextView;
private Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.vt_show);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
File file = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(file.getPath());
long blockSize = stat.getBlockSizeLong();
long availableBlocks = stat.getAvailableBlocksLong();
String data = Formatter.formatFileSize(this, blockSize * availableBlocks);
mTextView.setText(data);
}
}
}
加载的sdcard权限:
package="com.example.administrator.my0000000application">
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application