使用logcat让Android应用支持查看实时日志并输出至界面显示功能
不使用USB线接Android设备连接电脑，也不用电脑上装Android studio和logcat工具，
如何查看应用的实时日志呢？方法还是有的。
先附图：看这功能是不是很赞？
机器强大了就是好，有好多创新可以派上用场了。后续继续探索新鲜的新功能。
运维的兄弟们可以松口气了，给你们减减压。
日志排查获取从此如此简单。甚至可以给手机互通，日志显示到你手机上也能。
这有什么用？方便现场运维人员快速的协助研发定位和找到问题。当然了，没问题也不用看日志了。看日志就是为了分析和定位问题的一种有效途径。
且日志还是实时输出的，这样从应用的后门调起查看日志的窗口，就很方便的查看实时的日志输出啦
这功能是不是很赞？且可以清空窗口，保存日志，发送日志给后台等功能。
/**
Author:yangyongzhen
qq:534117529
Date:20200221
*/
package com.xxxx.xxx.activity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
public class LogActivity extends BaseActivity implements View.OnClickListener {
String cmds = "";
StringBuilder Sb = new StringBuilder("this is log");
private BufferedReader mReader = null;
private Process exec;
private int mPId;
private String mPID;
private boolean mRunning = true;
EditText etlog;
Button btnStop,btnSave,btnClear;
RandomAccessFile randomFile = null;
private final String DIR = CommonStatus.PATH_DIR + "/log";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
toDispPageInfo("日志查看");
etlog = findViewById(R.id.et_logs);
btnStop = findViewById(R.id.btn_stop);
btnStop.setOnClickListener(this);
btnSave = findViewById(R.id.btn_save);
btnSave.setOnClickListener(this);
btnClear = findViewById(R.id.btn_clear);
btnClear.setOnClickListener(this);
mPId = android.os.Process.myPid();
mPID = String.valueOf(mPId);
cmds = "logcat *:e *:d | grep \"(" + mPID + ")\"";;
}
@Override
protected void onResume() {
super.onResume();
try {
exec = Runtime.getRuntime().exec(cmds);
mReader = new BufferedReader(new InputStreamReader(exec.getInputStream()), 1024);
new Thread(new Runnable() {
@Override
public void run() {
String line="";
try {
while (mRunning && (line = mReader.readLine())!=null) {
Sb.append(line);
if (!mRunning) {
break;
}
if (line.length()==0) {
continue;
}
final Message msg = Message.obtain();
msg.what = 2;
msg.obj = line+ "\n";
mhandler.sendMessage(msg);
Thread.sleep(100);
}
}catch (Exception e){
Log.e(TAG, e.toString());
}
finally {
Log.e(TAG, "finally");
Log.e(TAG, "" + mRunning);
if (line == null) {
Log.e(TAG, "line is null");
}
if (exec != null) {
exec.destroy();
}
if (mReader != null) {
try {
mReader.close();
mReader = null;
} catch (IOException e) {
}
}
}
}
}).start();
} catch (IOException e) {
e.printStackTrace();
}
//startShowLog();
}
@Override
protected void onDestroy() {
super.onDestroy();
mRunning = false;
if (exec != null) {
exec.destroy();
}
if (mReader != null) {
try {
mReader.close();
mReader = null;
} catch (IOException e) {
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn_stop:
mRunning = false;
break;
case R.id.btn_save:
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-ddHHmmss", Locale.CHINA);
String date = format1.format(new Date(System.currentTimeMillis()));
try {
String path = DIR + "/" + date + ".log";
randomFile = new RandomAccessFile(path, "rw");
randomFile.write(etlog.getText().toString().getBytes());
Toast t = Toast.makeText(mContext, "日志保存成功,path="+path, Toast.LENGTH_SHORT);
t.show();
} catch (IOException e) {
//e.printStackTrace();
LogUtil.d(e.toString());
}
break;
case R.id.btn_clear:
etlog.setText("");
break;
}
}
@Override
public int initLayout() {
return R.layout.activity_log;
}
@Override
public void initView() {
toBack();
}
@Override
public void initData() {
}
@SuppressLint("HandlerLeak")
Handler mhandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
break;
case 2:
//显示日志
etlog.setMovementMethod(ScrollingMovementMethod.getInstance());
etlog.setSelection(etlog.getText().length(), etlog.getText().length());
etlog.setText(etlog.getText().append(msg.obj.toString()));
break;
}
}
};
}
作者：特立独行小猫咪
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