Android 通过JNI实现守护进程，使Service服务不被杀死

package com.yyh.fork;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;

public class NativeRuntime {

private static NativeRuntime theInstance = null;

private NativeRuntime() {

}

public static NativeRuntime getInstance() {
if (theInstance == null)
theInstance = new NativeRuntime();
return theInstance;
}

/**
* RunExecutable 启动一个可自行的lib*.so文件
* @date 2016-1-18 下午8:22:28
* @param pacaageName
* @param filename
* @param alias 别名
* @param args 参数
* @return
*/
public String RunExecutable(String pacaageName, String filename, String alias, String args) {
String path = "/data/data/" + pacaageName;
String cmd1 = path + "/lib/" + filename;
String cmd2 = path + "/" + alias;
String cmd2_a1 = path + "/" + alias + " " + args;
String cmd3 = "chmod 777 " + cmd2;
String cmd4 = "dd if=" + cmd1 + " of=" + cmd2;
StringBuffer sb_result = new StringBuffer();

if (!new File("/data/data/" + alias).exists()) {
RunLocalUserCommand(pacaageName, cmd4, sb_result); // 拷贝lib/libtest.so到上一层目录,同时命名为test.
sb_result.append(";");
}
RunLocalUserCommand(pacaageName, cmd3, sb_result); // 改变test的属性,让其变为可执行
sb_result.append(";");
RunLocalUserCommand(pacaageName, cmd2_a1, sb_result); // 执行test程序.
sb_result.append(";");
return sb_result.toString();
}

/**
* 执行本地用户命令
* @date 2016-1-18 下午8:23:01
* @param pacaageName
* @param command
* @param sb_out_Result
* @return
*/
public boolean RunLocalUserCommand(String pacaageName, String command, StringBuffer sb_out_Result) {
Process process = null;
try {
process = Runtime.getRuntime().exec("sh"); // 获得shell进程
DataInputStream inputStream = new DataInputStream(process.getInputStream());
DataOutputStream outputStream = new DataOutputStream(process.getOutputStream());
outputStream.writeBytes("cd /data/data/" + pacaageName + "\n"); // 保证在command在自己的数据目录里执行,才有权限写文件到当前目录
outputStream.writeBytes(command + " &\n"); // 让程序在后台运行，前台马上返回
outputStream.writeBytes("exit\n");
outputStream.flush();
process.waitFor();
byte[] buffer = new byte[inputStream.available()];
inputStream.read(buffer);
String s = new String(buffer);
if (sb_out_Result != null)
sb_out_Result.append("CMD Result:\n" + s);
} catch (Exception e) {
if (sb_out_Result != null)
sb_out_Result.append("Exception:" + e.getMessage());
return false;
}
return true;
}

public native void startActivity(String compname);

public native String stringFromJNI();

public native void startService(String srvname, String sdpath);

public native int findProcess(String packname);

public native int stopService();

static {
try {
System.loadLibrary("helper"); // 加载so库
} catch (Exception e) {
e.printStackTrace();
}
}

}

package com.yyh.activity;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

import com.yyh.fork.NativeRuntime;
import com.yyh.utils.FileUtils;
public class PhoneStatReceiver extends BroadcastReceiver {

private String TAG = "tag";

@Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
Log.i(TAG, "手机开机了~~");
NativeRuntime.getInstance().startService(context.getPackageName() + "/com.yyh.service.HostMonitor", FileUtils.createRootPath());
} else if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) {
}
}


}

package com.yyh.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class HostMonitor extends Service {

@Override
public void onCreate() {
super.onCreate();
Log.i("daemon_java", "HostMonitor: onCreate! I can not be Killed!");
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("daemon_java", "HostMonitor: onStartCommand! I can not be Killed!");
return super.onStartCommand(intent, flags, startId);
}

@Override
public IBinder onBind(Intent arg0) {
return null;
}
}

<receiver
android:name="com.yyh.activity.PhoneStatReceiver"
android:enabled="true"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>

<service android:name="com.yyh.service.HostMonitor"
android:enabled="true"
android:exported="true">
</service>