7 获取内存和SD卡状态

内核源码中查看

setting 中。

package com.itheima27.memorydemo;


import java.io.File;


import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.app.Activity;
import android.text.format.Formatter;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;


public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

TextView tvMemory = (TextView) findViewById(R.id.tv_memory);

File sdPath = Environment.getExternalStorageDirectory();// sd卡的路径
File dataPath = Environment.getDataDirectory();// 手机内存存储的路径

String sdcardMemory = getMemory(sdPath);
String dataMemory = getMemory(dataPath);

tvMemory.setText("SDCard内存状态: " + sdcardMemory + "\n手机内部存储状态: " + dataMemory);
}


/**
* 获取内存信息
*/
private String getMemory(File path) {
        StatFs stat = new StatFs(path.getPath());
        long blockSize = stat.getBlockSize(); // 获得扇区的单位
        long totalBlocks = stat.getBlockCount(); // 获得扇区的总数
        long availableBlocks = stat.getAvailableBlocks();// 获取可用的扇区总数
        
        long totalSpace = blockSize * totalBlocks;
        long availableSpace = blockSize * availableBlocks;
        
        String strTotalSpace = Formatter.formatFileSize(this, totalSpace);
        String strAvailableSpace = Formatter.formatFileSize(this, availableSpace);
        
        return "总空间: " + strTotalSpace + "\n可用控件: " + strAvailableSpace;
}
}