Android监听Log，悬浮显示

参考网址：http://blog.csdn.net/m_changgong/article/details/7661940

实现原理：1）执行logcat命令；

2）在service中把监听到的log内容通过广播发送出去；

3）Client端接收广播，获取log内容；

4）注意，添加读取log的权限

为什么要监听Log？

通过分析log可以监听系统安装、卸载软件等操作。

具体实现，见代码：

Runtime.getRuntime().exec("logcat -c").waitFor();
pro = Runtime.getRuntime().exec("logcat");

package com.taoshijie.debug.service;

import android.app.Service;

import android.content.Intent;

import android.graphics.PixelFormat;

import android.graphics.Rect;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.WindowManager;

import android.widget.ScrollView;

import android.widget.TextView;

import com.taoshijie.debug.R;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

 

public class LogFloatService extends Serviceimplements Runnable{

private int statusBarHeight;// 状态栏高度

private View view;// 透明窗体

private TextView tv_show = null;

private ScrollView scrollView = null;

private boolean viewAdded = false;// 透明窗体是否已经显示

private boolean viewHide = false; // 窗口隐藏

private WindowManager windowManager;

private WindowManager.LayoutParams layoutParams;

private boolean isObserverLog; //是否监听log

private Handler handler = new Handler(){

@Override

public void handleMessage(Message msg) {

if(msg.what == 0){

refresh((String)msg.obj, true);

}

}

};

@Override

public IBinder onBind(Intent arg0) {

return null;

}

@Override

public void onCreate() {

super.onCreate();

createFloatView();

}

@Override

public int onStartCommand(Intent intent, int flags,int startId) {

viewHide = false;

startLogObserver();

return super.onStartCommand(intent, flags,startId);

}

@Override

public void onDestroy() {

super.onDestroy();

stopLogObserver();

}

 

public void removeView() {

if (viewAdded) {

windowManager.removeView(view);

viewAdded = false;

}

}

private void createFloatView() {

view =LayoutInflater.from(this).inflate(R.layout.view_float_log,null);

tv_show = (TextView)view.findViewById(R.id.tv_show);

scrollView = (ScrollView)view.findViewById(R.id.scroll_view);

windowManager = (WindowManager)this.getSystemService(WINDOW_SERVICE);

 

layoutParams =newWindowManager.LayoutParams(WindowManager.LayoutParams.MATCH_PARENT,

WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,

WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,PixelFormat.TRANSPARENT);

layoutParams.gravity = Gravity.LEFT |Gravity.TOP;

 

view.setOnTouchListener(new View.OnTouchListener(){

float[] temp = new float[] { 0f, 0f };

public boolean onTouch(View v, MotionEvent event){

layoutParams.gravity = Gravity.LEFT |Gravity.TOP;

int eventaction = event.getAction();

switch (eventaction) {

case MotionEvent.ACTION_DOWN: // 按下事件，记录按下时手指在悬浮窗的XY坐标值

temp[0] = event.getX();

temp[1] = event.getY();

break;

case MotionEvent.ACTION_MOVE:

refreshView((int) (event.getRawX() - temp[0]),

(int) (event.getRawY() - temp[1]));

break;

}

return true;

}

});

view.findViewById(R.id.btn_clear).setOnClickListener(newView.OnClickListener() {

@Override

public void onClick(View v) {

refresh(null, false);

}

});

view.findViewById(R.id.btn_close).setOnClickListener(newView.OnClickListener() {

@Override

public void onClick(View v) {

refresh(null, false);

stopSelf();

}

});

}

 

private void refreshView(int x, int y) {

//状态栏高度不能立即取，不然得到的值是0

if (statusBarHeight == 0) {

View rootView = view.getRootView();

Rect r = new Rect();

rootView.getWindowVisibleDisplayFrame(r);

statusBarHeight = r.top;

}

layoutParams.x = x;

//y轴减去状态栏的高度，因为状态栏不是用户可以绘制的区域，不然拖动的时候会有跳动

layoutParams.y = y - statusBarHeight;//STATUS_HEIGHT;

refresh(null, true);

}

 

private void refresh(String value, boolean isAppend){

if(!isObserverLog){

return ;

}

if(isAppend){

if(value != null){

tv_show.append(value);

}

}else{

tv_show.setText(value);

}

scrollView.post(new Runnable() {

public void run() {

scrollView.fullScroll(ScrollView.FOCUS_DOWN);

}

});

// 如果已经添加了就只更新view

if (viewAdded) {

windowManager.updateViewLayout(view,layoutParams);

} else {

windowManager.addView(view, layoutParams);

viewAdded = true;

}

}

 

public void startLogObserver() {

if(!isObserverLog){

isObserverLog = true;

Thread mTherad = new Thread(this);

mTherad.start();

}

}

 

public void stopLogObserver() {

isObserverLog = false;

if(handler != null){

handler.removeMessages(0);

}

removeView();

}

@Override

public void run() {

Process pro = null;

try {

Runtime.getRuntime().exec("logcat-c").waitFor();

pro = Runtime.getRuntime().exec("logcat");

} catch (InterruptedException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

if(pro == null){

return ;

}

BufferedReader dis = newBufferedReader(newInputStreamReader(pro.getInputStream()));

String line = null;

while (isObserverLog) {

try {

while ((line = dis.readLine()) != null) {

if(handler != null){

Message msg=handler.obtainMessage();

msg.what = 0;

msg.obj = line+"\n";

handler.sendMessage(msg);

}

Thread.yield();

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

}