SDCard容量查询

 

public class sdcard extends Activity {
	TextView tv;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main); // 设置当前屏幕
		
		Button btn = (Button) findViewById(R.id.btn);
		btn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { // 判断是否插入SD卡
					
					File filePath = Environment.getExternalStorageDirectory(); // 获得sdcard的路径
					StatFs stat = new StatFs(filePath.getPath()); // 创建StatFs对象
					long blockSize = stat.getBlockSize(); // 获得block的size
					float totalBlocks = stat.getBlockCount(); // 获得总容量
					int sizeInMb = (int) (blockSize * totalBlocks) / 1024 / 1024; //
					long availableBlocks = stat.getAvailableBlocks(); // 获得可用容量
					float percent = availableBlocks / totalBlocks; // 获得可用比例
					percent = (int) (percent * 1000); // 舍去多余小数位数
					tv = (TextView) findViewById(R.id.tv);
					tv.setText("SD Card使用情况：\n总容量：" + sizeInMb + "M。\n已用"+ (1000 - percent) / 10.0f + "% 可用" + percent/ 10.f + "%。");
				
				} else {
					Toast.makeText(sdcard.this, "对不起，请先插入存储卡", 2000).show();
				}
			}
		});
	}
}