Android异常处理最佳实践 Android异常处理最佳实践

package com.example.administrator.exceptiontest;

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

/**
 * Created by Administrator on 2015/12/9.
 */
public class BaseApplication extends Application {

  public static Context mContext;
  //默认的异常处理
  public static Thread.UncaughtExceptionHandler defaultUncaughtExceptionHandler;

  @Override
  public void onCreate() {
    super.onCreate();
    mContext = this;
    //先取得默认的异常处理handler
    defaultUncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
    Thread.setDefaultUncaughtExceptionHandler(new BaseUncaughtExceptionHandler());
  }


}

package com.example.administrator.exceptiontest;

import android.app.ActivityManager;
import android.content.Context;
import android.os.Looper;

/**
 * Created by Administrator on 2015/12/9.
 */
public class Utils {

  /**
   * 判断是否在主线程中执行 如果是返回true 不是返回false
   */
  public static boolean isInMainThread() {
    //注意这个地方 我们无法一定可以取得myLooper的值的 比如说 你的thread 没有绑定消息循环
    //那你的mylooper就返回的一定是null了，只有绑定了以后才会返回相应的值
    return Looper.myLooper() == Looper.getMainLooper();
  }


  //判断是否是主进程 如果是 就返回true 否则返回false
  public static boolean isMainProcess(Context context)
  {
    return context.getPackageName().equals(getProcessName(context));
  }

  //取得进程名
  public static String getProcessName(Context context) {
    String currentProcessName = "";
    int pid = android.os.Process.myPid();
    ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    for (ActivityManager.RunningAppProcessInfo processInfo : manager.getRunningAppProcesses()) {
      if (processInfo.pid == pid) {
        currentProcessName = processInfo.processName;
        break;
      }
    }
    return currentProcessName;
  }

}

package com.example.administrator.exceptiontest;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;

/**
 * Created by Administrator on 2015/12/9.
 */
public class BaseUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {

  @Override
  public void uncaughtException(Thread thread, Throwable ex) {
    Writer resultWriter = new StringWriter();
    PrintWriter printWriter = new PrintWriter(resultWriter);
    ex.printStackTrace(printWriter);
    StringBuffer sb = new StringBuffer();
    sb.append("是否在主线程中发生异常" + Utils.isInMainThread() + "\n");
    sb.append("是否在主进程中发生异常" + Utils.isMainProcess(BaseApplication.mContext) + "\n");
    String errorReport = sb.toString() + resultWriter.toString();
    //这个地方最好把收集到的错误信息日志 上传至服务器 便于开发者定位修改问题。
    //如果是主进程发生了异常 那还是交给系统自己默认的异常处理来做。让用户感知到，否则用户啥都不知道 体验并不好
    //你当然也可以自己定义特殊的错误提示 比如一些有意思的dialog什么的
    if (Utils.isMainProcess(BaseApplication.mContext)) {
      BaseApplication.defaultUncaughtExceptionHandler.uncaughtException(thread, ex);
    } else {
      //如果是子进程发生异常 不要给提示 直接殺掉子進程最好 別讓用戶感知到
      android.os.Process.killProcess(android.os.Process.myPid());
    }
  }


}