Android 全局异常捕获实例详解

Android 全局异常捕获

今天就来说说作为程序猿的我们每天都会遇到的东西bug,出bug不可怕可怕的是没有出bug时的堆栈信息,那么对于bug的信息收集就显得尤为重要了,一般用第三方bugly或者友盟等等都能轻易收集,但是由于公司不让使用第三方,而安卓正好有原生的异常收集类UncaughtExceptionHandler,那么今天博客就从这个类开始.

UncaughtExceptionHandler见名知意,即他是处理我们未捕获的异常,具体使用分两步

1.实现我们自己的异常处理类

public class CrashHandler implements Thread.UncaughtExceptionHandler {
  @Override
  public void uncaughtException(Thread thread, Throwable ex) {

  }
}

需要我们实现Thread.UncaughtExceptionHandler接口当有未捕获的异常的时候会回调uncaughtException(Thread thread, Throwable ex)方法

2.设置该CrashHandler为系统默认的

Thread.setDefaultUncaughtExceptionHandler(crashHandler);

以上只是使用步骤的介绍,具体项目中的使用我直接贴代码

在application中初始化

package com.zly.www.basedemo.base;

import android.app.Application;
import android.content.Context;
import com.zly.www.basedemo.exception.CrashHandler;


public class AppApplication extends Application {


  private static Context mContext;

  @Override
  public void onCreate() {
    super.onCreate();
    this.mContext = this;
    CrashHandler.getInstance().init(this);//初始化全局异常管理
  }

  public static Context getContext(){
    return mContext;
  }
}

CrashHandler 实现类如下

package com.zly.www.basedemo.exception;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import com.zly.www.basedemo.utils.AppManager;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


public class CrashHandler implements Thread.UncaughtExceptionHandler {

  
  private Thread.UncaughtExceptionHandler mDefaultHandler;

  
  private Context mContext;

  
  private Map paramsMap = new HashMap<>();

  
  private SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

  private String TAG = this.getClass().getSimpleName();

  private static CrashHandler mInstance;

  private CrashHandler() {

  }

  
  public static synchronized CrashHandler getInstance(){
    if(null == mInstance){
      mInstance = new CrashHandler();
    }
    return mInstance;
  }

  public void init(Context context){
    mContext = context;
    mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
    //设置该CrashHandler为系统默认的
    Thread.setDefaultUncaughtExceptionHandler(this);
  }

  
  @Override
  public void uncaughtException(Thread thread, Throwable ex) {
    if(!handleException(ex) && mDefaultHandler != null){//如果自己没处理交给系统处理
      mDefaultHandler.uncaughtException(thread,ex);
    }else{//自己处理
      try {//延迟3秒杀进程
 Thread.sleep(3000);
      } catch (InterruptedException e) {
 Log.e(TAG, "error : ", e);
      }
      //退出程序
      AppManager.getAppManager().AppExit(mContext);
    }

  }

  
  private boolean handleException(Throwable ex) {
    if (ex == null) {
      return false;
    }
    //收集设备参数信息
    collectDeviceInfo(mContext);
    //添加自定义信息
    addCustomInfo();
    //使用Toast来显示异常信息
    new Thread() {
      @Override
      public void run() {
 Looper.prepare();
 Toast.makeText(mContext, "程序开小差了呢..", Toast.LENGTH_SHORT).show();
 Looper.loop();
      }
    }.start();
    //保存日志文件
    saveCrashInfo2File(ex);
    return true;
  }


  
  public void collectDeviceInfo(Context ctx) {
    //获取versionName,versionCode
    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 + "";
 paramsMap.put("versionName", versionName);
 paramsMap.put("versionCode", versionCode);
      }
    } catch (PackageManager.NameNotFoundException e) {
      Log.e(TAG, "an error occured when collect package info", e);
    }
    //获取所有系统信息
    Field[] fields = Build.class.getDeclaredFields();
    for (Field field : fields) {
      try {
 field.setAccessible(true);
 paramsMap.put(field.getName(), field.get(null).toString());
      } catch (Exception e) {
 Log.e(TAG, "an error occured when collect crash info", e);
      }
    }
  }

  
  private void addCustomInfo() {

  }

  
  private String saveCrashInfo2File(Throwable ex) {

    StringBuffer sb = new StringBuffer();
    for (Map.Entry entry : paramsMap.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 {
      long timestamp = System.currentTimeMillis();
      String time = format.format(new Date());
      String fileName = "crash-" + time + "-" + timestamp + ".log";
      if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
 String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/crash/";
 File dir = new File(path);
 if (!dir.exists()) {
   dir.mkdirs();
 }
 FileOutputStream fos = new FileOutputStream(path + fileName);
 fos.write(sb.toString().getBytes());
 fos.close();
      }
      return fileName;
    } catch (Exception e) {
      Log.e(TAG, "an error occured while writing file...", e);
    }
    return null;
  }
}

activity管理类

package com.zly.www.basedemo.utils;

import java.util.Stack;

import android.app.Activity; 
import android.app.ActivityManager; 
import android.content.Context;


public class AppManager { 

  // Activity栈 
  private static Stack activityStack; 
  // 单例模式 
  private static AppManager instance; 

  private AppManager() { 
  } 

   
  public static AppManager getAppManager() { 
    if (instance == null) { 
      instance = new AppManager(); 
    } 
    return instance; 
  } 

   
  public void addActivity(Activity activity) { 
    if (activityStack == null) { 
      activityStack = new Stack(); 
    } 
    activityStack.add(activity); 
  } 

   
  public Activity currentActivity() { 
    Activity activity = activityStack.lastElement(); 
    return activity; 
  } 

   
  public void finishActivity() { 
    Activity activity = activityStack.lastElement(); 
    finishActivity(activity); 
  } 

   
  public void finishActivity(Activity activity) { 
    if (activity != null) { 
      activityStack.remove(activity); 
      activity.finish(); 
      activity = null; 
    } 
  } 

   
  public void finishActivity(Class cls) { 
    for (Activity activity : activityStack) { 
      if (activity.getClass().equals(cls)) { 
 finishActivity(activity);
 break;
      } 
    } 
  } 

   
  public void finishAllActivity() { 
    for (int i = 0; i < activityStack.size(); i++) { 
      if (null != activityStack.get(i)) { 
 activityStack.get(i).finish(); 
      } 
    } 
    activityStack.clear(); 
  } 

   
  public void AppExit(Context context) { 
    try { 
      finishAllActivity(); 
      //退出程序
      android.os.Process.killProcess(android.os.Process.myPid());
      System.exit(1); 
    } catch (Exception e) { 
    } 
  } 
} 

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