实时获取Android手机CPU频率

Android手机的CPU的频率信息被保存在 /sys/devices/system/cpu/cpu0/cpufreq 目录下，通过shell命令查看该目录下的文件，如下图

其中cpuinfo_cur_freq文件保存CPU当前频率，cpuinfo_max_freq保存CPU可运行最大频率，cpuinfo_min_freq保存CPU可运行最小频率。通过定时读取这些文件便可实时获取CPU频率。

1.创建getCPU类，获取CPU频率信息。

import java.io.BufferedReader;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.io.InputStreamReader;public class getCPU {    private final static String CurPath = "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq";//保存当前CPU频率    //获取当前CPU频率    public static int getCurCPU(){        int result = 0;        FileReader fr = null;        BufferedReader br = null;        try{            fr = new FileReader(CurPath);            br = new BufferedReader(fr);            String text = br.readLine();            result = Integer.parseInt(text.trim());        }catch (FileNotFoundException e){            e.printStackTrace();        }catch (IOException e){            e.printStackTrace();        }finally {            if (fr != null)                try{                    fr.close();                }catch (IOException e){                    e.printStackTrace();                }            if (br != null)                try{                    br.close();                }catch (IOException e){                    e.printStackTrace();                }        }        return result;    }private final static String MaxPath = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq";//保存CPU可运行最大频率    //获取CPU可运行最大频率    public static int getMaxCPU(){        int result = 0;        FileReader fr = null;        BufferedReader br = null;        try{            fr = new FileReader(MaxPath);            br = new BufferedReader(fr);            String text = br.readLine();            result = Integer.parseInt(text.trim());        }catch (FileNotFoundException e){            e.printStackTrace();        }catch (IOException e){            e.printStackTrace();        }finally {            if (fr != null)                try{                    fr.close();                }catch (IOException e){                    e.printStackTrace();                }            if (br != null)                try{                    br.close();                }catch (IOException e){                    e.printStackTrace();                }        }        return result;    }   private final static String MinPath = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq";//保存CPU可运行最小频率    //获取CPU可运行最小频率    public static int getMinCPU(){        int result = 0;        FileReader fr = null;        BufferedReader br = null;        try{            fr = new FileReader(MinPath);            br = new BufferedReader(fr);            String text = br.readLine();            result = Integer.parseInt(text.trim());        }catch (FileNotFoundException e){            e.printStackTrace();        }catch (IOException e){            e.printStackTrace();        }finally {            if (fr != null)                try{                    fr.close();                }catch (IOException e){                    e.printStackTrace();                }            if (br != null)                try{                    br.close();                }catch (IOException e){                    e.printStackTrace();                }        }        return result;    }}

2.MainActivity

public class MainActivity extends Activity {    private TextView textView1;    public void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView1 = (TextView) findViewById(R.id.show_CPU);        new Thread(){            public void run(){                try{                    while (true){                        Thread.sleep(30000);//设置时间间隔为30s                        Message msg = new Message();                        msg.what = UPDATE;                        handler.sendMessage(msg);                    }                }catch (InterruptedException e){                    e.printStackTrace();                }            }        }.start();    }    getCPU getcpu = new getCPU();    private static final int UPDATE = 0;    private Handler handler = new Handler(){        public void handleMessage(Message msg){            switch (msg.what){                case UPDATE:                    textView1.setText("");                    textView1.append("CPU最大频率为："+ Integer.toString(getcpu.getMaxCPU()) + "\n");                    textView1.append("CPU最小频率为："+ Integer.toString(getcpu.getMinCPU()) + "\n");                    textView1.append("CPU当前频率为："+ Integer.toString(getcpu.getCurCPU()) + "\n");                    break;                default:                    break;            }            super.handleMessage(msg);        }    };}

3.activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent"    android:weightSum="1">        <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/show_CPU" /></LinearLayout>

运行效果如图，可以看出实现了实时获取CPU的频率。