LogcatHelperDemo【应用log信息保存成本地文件】

版权声明：本文为HaiyuKing原创文章，转载请注明出处！

前言

简单记录下LogcatHelper的使用，并对原有代码进行了修改【因为保存到应用内的目录中不需要申请权限，所以去掉保存到SD的功能--个人觉得这个类主要用于开发者自己调试用】：

    /**初始化目录 "包名+logcat"
     * */
    public void init(Context context) {
//        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {// 优先保存到SD卡中
//            PATH_LOGCAT = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + context.getPackageName() + File.separator + "logcat";
//        } else {
            //如果SD卡不存在，就保存到本应用的目录下【why 直接保存到本应用的目录下】
            PATH_LOGCAT = context.getFilesDir().getAbsolutePath() + File.separator + "logcat";
//        }
        File file = new File(PATH_LOGCAT);
        if (!file.exists()) {
            file.mkdirs();
        }
    }

效果图

存储在应用内的目录：

logcat-2018-08-14.log 

2018-08-14 10:18:06  I/art     (24242): Late-enabling -Xcheck:jni
2018-08-14 10:18:06  W/art     (24242): Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
2018-08-14 10:18:06  E/Process (24242): android_os_Process_getProcessNameByPid pid is 24242
2018-08-14 10:18:06  E/Process (24242): android_os_Process_getProcessNameByPid value is ogcathelperdemo
2018-08-14 10:18:06  V/MainActivity(24242): 这是V日志
2018-08-14 10:18:06  D/MainActivity(24242): 这是D日志
2018-08-14 10:18:06  I/MainActivity(24242): 这是I日志
2018-08-14 10:18:06  W/MainActivity(24242): 这是W日志
2018-08-14 10:18:06  E/MainActivity(24242): 这是E日志
2018-08-14 10:18:06  V/PhoneWindow(24242): DecorView setVisiblity: visibility = 4 ,Parent =null, this =com.android.internal.policy.impl.PhoneWindow$DecorView{34498aa9 I.E..... R.....ID 0,0-0,0}
2018-08-14 10:18:06  D/OpenGLRenderer(24242): Dumper init 4 threads <0x7f84d321c0>
2018-08-14 10:18:06  D/OpenGLRenderer(24242): <com.why.project.logcathelperdemo> is running.
2018-08-14 10:18:06  D/OpenGLRenderer(24242): <com.why.project.logcathelperdemo> setHwuiLog: debug.egl.trace=false
2018-08-14 10:18:06  D/OpenGLRenderer(24242): initialize DisplayEventReceiver 0x7f8ac1a400
2018-08-14 10:18:06  D/OpenGLRenderer(24242): Use EGL_SWAP_BEHAVIOR_PRESERVED: true
2018-08-14 10:18:06  D/Atlas   (24242): Validating map...
2018-08-14 10:18:06  D/ViewRootImpl(24242): hardware acceleration is enabled, this = ViewRoot{296d9189 com.why.project.logcathelperdemo/com.why.project.logcathelperdemo.MainActivity,ident = 0}
2018-08-14 10:18:06  V/PhoneWindow(24242): DecorView setVisiblity: visibility = 0 ,Parent =ViewRoot{296d9189 com.why.project.logcathelperdemo/com.why.project.logcathelperdemo.MainActivity,ident = 0}, this =com.android.internal.policy.impl.PhoneWindow$DecorView{34498aa9 V.E..... R.....ID 0,0-0,0}
2018-08-14 10:18:06  D/OpenGLRenderer(24242): CanvasContext() 0x7f8ac1db40 initialize 0x7f91e3c610
2018-08-14 10:18:06  D/MALI    (24242): eglInitialize:1479: [+]
2018-08-14 10:18:06  E/GED     (24242): Failed to get GED Log Buf, err(0)
2018-08-14 10:18:06  D/MALI    (24242): eglInitialize:1850: [-]
2018-08-14 10:18:06  I/        (24242): elapse(include ctx switch):3533 (ms), eglInitialize
2018-08-14 10:18:06  I/OpenGLRenderer(24242): Initialized EGL, version 1.4
2018-08-14 10:18:06  D/MALI    (24242): eglCreateContext:206: [MALI] eglCreateContext display 0x7f91c5fd00, share context 0x0 here.
2018-08-14 10:18:06  D/MALI    (24242): gles_context_new:248: Create GLES ctx 0x7f8ae8a008 successfully
2018-08-14 10:18:06  D/MALI    (24242): eglCreateContext:543: [MALI] eglCreateContext end. Created context 0x7f8ae7ad80 here.
2018-08-14 10:18:06  D/OpenGLRenderer(24242): Created EGL context (0x7f8ae37040)
2018-08-14 10:18:06  I/OpenGLRenderer(24242): Get enable program binary service property (1)
2018-08-14 10:18:06  I/OpenGLRenderer(24242): Initializing program atlas...
2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getFileDescriptor
2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramMapLen
2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramMapArray
2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramBinaryLen
2018-08-14 10:18:06  I/OpenGLRenderer(24242): Program binary detail: Binary length is 169984, program map length is 152.
2018-08-14 10:18:06  I/OpenGLRenderer(24242): Succeeded to mmap program binaries. File descriptor is 46, and path is /dev/ashmem{.
2018-08-14 10:18:06  I/OpenGLRenderer(24242): No need to use file discriptor anymore, close fd(46).
2018-08-14 10:18:06  D/OpenGLRenderer(24242): TaskManager() 0x7f8acff1f0, cpu = 8, thread = 4
2018-08-14 10:18:06  D/OpenGLRenderer(24242): Initializing program cache from 0x0, size = -1
2018-08-14 10:18:06  D/OpenGLRenderer(24242): Enabling debug mode 0
2018-08-14 10:18:06  D/Surface (24242): Surface::connect(this=0x7f91e3c600,api=1)
2018-08-14 10:18:06  D/mali_winsys(24242): new_window_surface returns 0x3000
2018-08-14 10:18:06  D/Surface (24242): Surface::allocateBuffers(this=0x7f91e3c600)
2018-08-14 10:18:06  D/OpenGLRenderer(24242): [TaskMgr] Running thread hwuiTask1 (24290)
2018-08-14 10:18:06  W/MALI    (24242): glDrawArrays:714: [MALI] glDrawArrays takes more than 5ms here. Total elapse time(us): 6667
2018-08-14 10:18:06  D/OpenGLRenderer(24242): ProgramCache save to disk, size = 3
2018-08-14 10:18:06  V/InputMethodManager(24242): onWindowFocus: null softInputMode=288 first=true flags=#81810100
2018-08-14 10:18:06  V/InputMethodManager(24242): START INPUT: com.android.internal.policy.impl.PhoneWindow$DecorView{34498aa9 V.E..... R....... 0,0-1080,1920} ic=null tba=android.view.inputmethod.EditorInfo@2ce154f2 controlFlags=#104
2018-08-14 10:18:06  D/InputMethodManager(24242): receive service's setActive call, active:true
2018-08-14 10:18:06  I/InputMethodManager(24242): handleMessage: MSG_SET_ACTIVE true, was false

使用步骤

一、项目组织结构图

注意事项：

1、  导入类文件后需要change包名以及重新import R文件路径

2、  Values目录下的文件（strings.xml、dimens.xml、colors.xml等），如果项目中存在，则复制里面的内容，不要整个覆盖

二、导入步骤

（1）将logcathelper包复制到项目中

package com.why.project.logcathelperdemo.logcathelper;

import android.content.Context;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Created by HaiyuKing
 * Used log日志统计保存到本地文件
 * 参考资料 Android将应用log信息保存文件：http://www.cnblogs.com/weixing/p/3414164.html
 */
public class LogcatHelper {
    private static LogcatHelper INSTANCE = null;
    /**日志文件保存路径*/
    private static String PATH_LOGCAT;
    private LogDumper mLogDumper = null;
    /**应用进程ID*/
    private int mPId;

    /**初始化目录 "包名+logcat"
     * */
    public void init(Context context) {
//        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {// 优先保存到SD卡中
//            PATH_LOGCAT = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + context.getPackageName() + File.separator + "logcat";
//        } else {
            //如果SD卡不存在，就保存到本应用的目录下【why 直接保存到本应用的目录下】
            PATH_LOGCAT = context.getFilesDir().getAbsolutePath() + File.separator + "logcat";
//        }
        File file = new File(PATH_LOGCAT);
        if (!file.exists()) {
            file.mkdirs();
        }
    }
    /**单例模式
     * */
    public static LogcatHelper getInstance(Context context) {
        if (INSTANCE == null) {
            INSTANCE = new LogcatHelper(context);
        }
        return INSTANCE;
    }

    private LogcatHelper(Context context) {
        init(context);
        mPId = android.os.Process.myPid();
    }

    public void start() {
        if (mLogDumper == null)
            mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
        mLogDumper.start();
    }

    public void stop() {
        if (mLogDumper != null) {
            mLogDumper.stopLogs();
            mLogDumper = null;
        }
    }

    private class LogDumper extends Thread {

        private Process logcatProc;
        private BufferedReader mReader = null;
        private boolean mRunning = true;
        String cmds = null;
        private String mPID;
        private FileOutputStream out = null;

        public LogDumper(String pid, String dir) {
            mPID = pid;
            try {
                out = new FileOutputStream(new File(dir, "logcat-" + MyDate.getFileName() + ".log"));
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            /**
             * 
             * 日志等级：*:v , *:d , *:w , *:e , *:f , *:s
             * 
             * 显示当前mPID程序的 E和W等级的日志.
             * 
             * */

            // cmds = "logcat *:e *:w | grep "(" + mPID + ")"";
            cmds = "logcat  | grep "(" + mPID + ")"";//打印所有日志信息
            // cmds = "logcat -s way";//打印标签过滤信息
            //cmds = "logcat *:e *:i | grep "(" + mPID + ")"";

        }

        public void stopLogs() {
            mRunning = false;
        }

        @Override
        public void run() {
            try {
                logcatProc = Runtime.getRuntime().exec(cmds);
                mReader = new BufferedReader(new InputStreamReader(logcatProc.getInputStream()), 1024);
                String line = null;
                while (mRunning && (line = mReader.readLine()) != null) {
                    if (!mRunning) {
                        break;
                    }
                    if (line.length() == 0) {
                        continue;
                    }
                    if (out != null && line.contains(mPID)) {
                        out.write((MyDate.getDateEN() + "  " + line + "
")
                                .getBytes());
                    }
                }

            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (logcatProc != null) {
                    logcatProc.destroy();
                    logcatProc = null;
                }
                if (mReader != null) {
                    try {
                        mReader.close();
                        mReader = null;
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (out != null) {
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    out = null;
                }
            }
        }
    }
}
LogcatHelper.java
package com.why.project.logcathelperdemo.logcathelper;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * Created by HaiyuKing
 * Used
 */
public class MyDate {
    public static String getFileName() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd",Locale.CHINA);
        String date = format.format(new Date(System.currentTimeMillis()));
        return date;// 2012-10-03
    }

    public static String getDateEN() {
        SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.CHINA);
        String date1 = format1.format(new Date(System.currentTimeMillis()));
        return date1;// 2012-10-03 23:41:31
    }
}
MyDate.java

（2）新建MyApplication.java并添加以下代码

package com.why.project.logcathelperdemo;

import android.app.Application;

import com.why.project.logcathelperdemo.logcathelper.LogcatHelper;

/**
 * Created by HaiyuKing
 * Used 自定义application
 */

public class MyApplication extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        //在应用中start LogcatHelper
        LogcatHelper.getInstance(this).start();
    }

    @Override
    public void onTerminate() {
        super.onTerminate();
        //在应用中stop LogcatHelper
        LogcatHelper.getInstance(this).stop();
    }

    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
    }

}

（3）在AndroidManifest.xml中申请MyApplication

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.why.project.logcathelperdemo">

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

（4）使用完之后，记得调用一下LogcatHelper.getInstance(this).stop();，MyApplication中执行的LogcatHelper.getInstance(this).stop();，可能有时候执行不到，保险起见，可以在第一个activity的onDestroy中执行LogcatHelper.getInstance(this).stop();

三、使用方法

正常执行Log方法即可。

package com.why.project.logcathelperdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.why.project.logcathelperdemo.logcathelper.LogcatHelper;

public class MainActivity extends AppCompatActivity {

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

        Log.v("MainActivity", "这是V日志");
        Log.d("MainActivity", "这是D日志");
        Log.i("MainActivity", "这是I日志");
        Log.w("MainActivity", "这是W日志");
        Log.e("MainActivity", "这是E日志");
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();

        //使用完后，调用stop
        LogcatHelper.getInstance(getApplicationContext()).stop();
    }
}

混淆配置

无

参考资料

Android将应用log信息保存文件

Android将应用log信息保存文件

项目demo下载地址

https://github.com/haiyuKing/LogcatHelperDemo

【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/whycxb/p/9467099.html