android：显示设备信息和内存信息

布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android=""
    android:id="@+id/ScrollView01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="CPU Info:"
            android:textColor="#FF0000" />

        <TextView
            android:id="@+id/cpuinfo"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Memory Info:"
            android:textColor="#0000FF" />

        <TextView
            android:id="@+id/memoryinfo"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

</ScrollView>

MainActivity.java

package com.example.android;

import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity
{
    private TextView cpuInfo;
    private TextView memoryInfo;

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

        cpuInfo = (TextView) findViewById(R.id.cpuinfo);
        cpuInfo.setText(getCPUinfo());
        memoryInfo = (TextView)findViewById(R.id.memoryinfo);
        memoryInfo.setText(getMemoryInfo());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    private String getMemoryInfo()
    {
        ProcessBuilder cmd;
        String result = new String();

        try
        {
            String[] args = { "/system/bin/cat", "/proc/meminfo" };
            cmd = new ProcessBuilder(args);

            Process process = cmd.start();
            InputStream in = process.getInputStream();
            byte[] re = new byte[1024];
            while (in.read(re) != -1)
            {
                System.out.println(new String(re));
                result = result + new String(re);
            }
            in.close();
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
        return result;
    }

    private String getCPUinfo()
    {
        ProcessBuilder cmd;
        String result = "";

        try
        {
            String[] args = { "/system/bin/cat", "/proc/cpuinfo" };
            cmd = new ProcessBuilder(args);

            Process process = cmd.start();
            InputStream in = process.getInputStream();
            byte[] re = new byte[1024];
            while (in.read(re) != -1)
            {
                System.out.println(new String(re));
                result = result + new String(re);
            }
            in.close();
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
        return result;
    }

}

效果图：