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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:jni2018-08-14 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$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable2018-08-14 10:18:06  E/Process (24242): android_os_Process_getProcessNameByPid pid is 242422018-08-14 10:18:06  E/Process (24242): android_os_Process_getProcessNameByPid value is ogcathelperdemo2018-08-14 10:18:06  V/MainActivity(24242): 这是V日志2018-08-14 10:18:06  D/MainActivity(24242): 这是D日志2018-08-14 10:18:06  I/MainActivity(24242): 这是I日志2018-08-14 10:18:06  W/MainActivity(24242): 这是W日志2018-08-14 10:18:06  E/MainActivity(24242): 这是E日志2018-08-14 10:18:06  V/PhoneWindow(24242): DecorView setVisiblity: visibility = 4 ,Parent =null, this =com.android.internal.policy.impl.PhoneWindow$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): 
     
       is running.2018-08-14 10:18:06  D/OpenGLRenderer(24242): 
      
        setHwuiLog: debug.egl.trace=false2018-08-14 10:18:06  D/OpenGLRenderer(24242): initialize DisplayEventReceiver 0x7f8ac1a4002018-08-14 10:18:06  D/OpenGLRenderer(24242): Use EGL_SWAP_BEHAVIOR_PRESERVED: true2018-08-14 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 0x7f91e3c6102018-08-14 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), eglInitialize2018-08-14 10:18:06  I/OpenGLRenderer(24242): Initialized EGL, version 1.42018-08-14 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 successfully2018-08-14 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.getFileDescriptor2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramMapLen2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramMapArray2018-08-14 10:18:06  D/ProgramBinary/Service(24242): BpProgramBinaryService.getProgramBinaryLen2018-08-14 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 = 42018-08-14 10:18:06  D/OpenGLRenderer(24242): Initializing program cache from 0x0, size = -12018-08-14 10:18:06  D/OpenGLRenderer(24242): Enabling debug mode 02018-08-14 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 0x30002018-08-14 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): 66672018-08-14 10:18:06  D/OpenGLRenderer(24242): ProgramCache save to disk, size = 32018-08-14 10:18:06  V/InputMethodManager(24242): onWindowFocus: null softInputMode=288 first=true flags=#818101002018-08-14 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=#1042018-08-14 10:18:06  D/InputMethodManager(24242): receive service's setActive call, active:true2018-08-14 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 + "\n")                                .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;                }            }        }    }}

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    }}

（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

（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

项目demo下载地址