开发过程中或多或少肯定会出现问题，有的可以百分百复现，可以很快的定位到问题，但有的只是偶尔出现一次，定位问题会困难很多，所以可以使用CrashHandler解决一下这样的情况
package com.avatar.demo.utils;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.util.Log;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
/**
* Created by Forrest.
* User: Administrator
* Date: 2021/9/30
* Description:
*/
public class CrashHandlers implements UncaughtExceptionHandler {
public static final String TAG = "CrashHandler";
// 系统默认的UncaughtException处理类
private UncaughtExceptionHandler mDefaultHandler;
// CrashHandler实例
private static CrashHandlers INSTANCE = new CrashHandlers();
// 程序的Context对象
private Context mContext;
// 用来存储设备信息和异常信息
private Map<String, String> infos = new HashMap<String, String>();
/**
* 保证只有一个CrashHandler实例
*/
private CrashHandlers() {
}
/**
* 获取CrashHandler实例 ,单例模式
*/
public static CrashHandlers getInstance() {
return INSTANCE;
}
/**
* 初始化
*
* @param context
*/
public void init(Context context) {
Log.e("CrashHandler","...........................2");
mContext = context;
// 获取系统默认的UncaughtException处理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
// 设置该CrashHandler为程序的默认处理器
Thread.setDefaultUncaughtExceptionHandler(this);
}
/**
* 当UncaughtException发生时会转入该函数来处理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
if (!handleException(ex) && mDefaultHandler != null) {
// 如果用户没有处理则让系统默认的异常处理器来处理
mDefaultHandler.uncaughtException(thread, ex);
} else {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
Log.e(TAG, "error : ", e);
}
// 退出程序
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
}
/**
* 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
*
* @param ex
* @return true:如果处理了该异常信息;否则返回false.
*/
private boolean handleException(Throwable ex) {
if (ex == null) {
return false;
}
// 收集设备参数信息
collectDeviceInfo(mContext);
// 保存日志文件
saveCrashInfo2File(ex);
return false;
}
/**
* 收集设备参数信息
*
* @param ctx
*/
public void collectDeviceInfo(Context ctx) {
try {
PackageManager pm = ctx.getPackageManager();
PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
if (pi != null) {
String versionName = pi.versionName == null ? "null" : pi.versionName;
String versionCode = pi.versionCode + "";
infos.put("versionName", versionName);
infos.put("versionCode", versionCode);
}
} catch (NameNotFoundException e) {
Log.e(TAG, "an error occured when collect package info", e);
}
Field[] fields = Build.class.getDeclaredFields();
for (Field field : fields) {
try {
field.setAccessible(true);
infos.put(field.getName(), field.get(null).toString());
Log.d(TAG, field.getName() + " : " + field.get(null));
} catch (Exception e) {
Log.e(TAG, "an error occured when collect crash info", e);
}
}
}
/**
* 保存错误信息到文件中
*
* @param ex
* @return 返回文件名称, 便于将文件传送到服务器
*/
private String saveCrashInfo2File(Throwable ex) {
Log.e(TAG,"------1"+ ex.getMessage());
StringBuffer sb = new StringBuffer();
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
String time = year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
sb.append("\r\n");
sb.append("\r\n");
sb.append("\r\n");
sb.append("************************************************"+time+"****************************************"+"\r\n");
sb.append("\r\n");
for (Map.Entry<String, String> entry : infos.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key + "=" + value + "\n");
}
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
sb.append(result);
try {
String fileName = "errorLog.txt";
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String path = Environment.getExternalStorageDirectory() + "/errorLog";
Log.e(TAG, "-----2"+path);
File dir = new File(path);
if (!dir.exists()) {
dir.mkdir();
}
File file = new File(path + File.separator + fileName);
if (!file.exists()) {
file.createNewFile();
}
FileWriter fileWriter = new FileWriter(file, true);
fileWriter.write(sb.toString());
fileWriter.close();
}
return fileName;
} catch (Exception e) {
return null;
}
}
}
添加这样一个工具类，剩下的就是使用了，我们新建一个Application，在里面的onCreate()方法里面加上
CrashHandlers crashHandlers = CrashHandlers.getInstance();
crashHandlers.init(this);
然后在清单文件里面使用这个Application，完成这些后你的程序崩溃了就会将崩溃日志记录到的指定的文件里面了，点进去里面记录的很详细，如果你的设备是Android6.0以后的，记得要加运行时权限让你的程序可以访问读写文件的权限，快速加入运行时权限可以参考这里