android 下的内存状态获取

import java.io.File;

import android.app.Activity;

import android.os.Bundle;

import android.os.Environment;

import android.os.StatFs;

import android.text.format.Formatter;

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 tvMemoryInfo = (TextView) findViewById(R.id.tv_memory_info);

// 获得sd卡的内存状态

File sdcardFileDir = Environment.getExternalStorageDirectory();

String sdcardMemory = getMemoryInfo(sdcardFileDir);

// 获得手机内部存储控件的状态

File dataFileDir = Environment.getDataDirectory();

String dataMemory = getMemoryInfo(dataFileDir);

tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手机内部: " + dataMemory);

}

/**

* 根据路径获取内存状态

* @param path

* @return

*/

private String getMemoryInfo(File path) {

// 获得一个磁盘状态对象

        StatFs stat = new StatFs(path.getPath());

        

        long blockSize = stat.getBlockSize(); // 获得一个扇区的大小

        

        long totalBlocks = stat.getBlockCount(); // 获得扇区的总数

        

        long availableBlocks = stat.getAvailableBlocks(); // 获得可用的扇区数量

        

        // 总空间

        String totalMemory =  Formatter.formatFileSize(this, totalBlocks * blockSize);

        // 可用空间

        String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSize);

return "总空间: " + totalMemory + "\n可用空间: " + availableMemory;

}

}