1 package com.lidaochen.getsdcardspace;
2
3 import android.os.Environment;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.widget.EditText;
7 import android.widget.TextView;
8
9 import java.io.File;
10 import java.util.Formatter;
11
12 public class MainActivity extends AppCompatActivity {
13 private TextView et_total;
14 private TextView et_useAble;
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18 setContentView(R.layout.activity_main);
19 // 1.找到两个EditText控件
20 et_total = (TextView)findViewById(R.id.et_total);
21 et_useAble = (TextView)findViewById(R.id.et_useAble);
22 // 2.获取SD卡总大小和可用空间
23 File file = Environment.getExternalStorageDirectory();
24 long totalSpace = file.getTotalSpace(); // 总大小
25 long useAbleSpace = file.getUsableSpace(); // 可用空间大小
26 // 3.展示到TextView上
27 et_total.setText("总大小：" + String.format("%.2f", (double)totalSpace / (1024 * 1024 * 1024)) + "GB");
28 et_useAble.setText("可用空间：" + String.format("%.2f", (double)useAbleSpace / (1024 * 1024 * 1024)) + "GB");
29 }
30 }
