CrashHandler.java

package jianshu.io.app.util;

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.os.Looper;
import android.util.Log;
import android.widget.Toast;

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

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,由该类来接管程序,并记录发送错误报告.
 *
 * @author way
 *
 */
public class CrashHandler implements UncaughtExceptionHandler {
  private static final String TAG = "CrashHandler";
  private Thread.UncaughtExceptionHandler mDefaultHandler;// 系统默认的UncaughtException处理类
  private static CrashHandler INSTANCE = new CrashHandler();// CrashHandler实例
  private Context mContext;// 程序的Context对象
  private Map<String, String> info = new HashMap<String, String>();// 用来存储设备信息和异常信息
  private SimpleDateFormat format = new SimpleDateFormat(
      "yyyy-MM-dd-HH-mm-ss");// 用于格式化日期,作为日志文件名的一部分

  /** 保证只有一个CrashHandler实例 */
  private CrashHandler() {

  }

  /** 获取CrashHandler实例 ,单例模式 */
  public static CrashHandler getInstance() {
    return INSTANCE;
  }

  /**
   * 初始化
   *
   * @param context
   */
  public void init(Context context) {
    mContext = context;
    mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();// 获取系统默认的UncaughtException处理器
    Thread.setDefaultUncaughtExceptionHandler(this);// 设置该CrashHandler为程序的默认处理器
  }

  /**
   * 当UncaughtException发生时会转入该重写的方法来处理
   */
  public void uncaughtException(Thread thread, Throwable ex) {
    if (!handleException(ex) && mDefaultHandler != null) {
      // 如果自定义的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);// 如果处理了，让程序继续运行3秒再退出，保证文件保存并上传到服务器
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
      // 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
   *            异常信息
   * @return true 如果处理了该异常信息;否则返回false.
   */
  public boolean handleException(Throwable ex) {
    if (ex == null)
      return false;
    new Thread() {
      public void run() {
        Looper.prepare();
        Toast.makeText(mContext, "哎呀!:(, 简书APP遇到一点问题.", Toast.LENGTH_LONG).show();
        Looper.loop();
      }
    }.start();
    // 收集设备参数信息
    collectDeviceInfo(mContext);
    // 保存日志文件
    saveCrashInfo2File(ex);
    return true;
  }

  /**
   * 收集设备参数信息
   *
   * @param context
   */
  public void collectDeviceInfo(Context context) {
    try {
      PackageManager pm = context.getPackageManager();// 获得包管理器
      PackageInfo pi = pm.getPackageInfo(context.getPackageName(),
          PackageManager.GET_ACTIVITIES);// 得到该应用的信息，即主Activity
      if (pi != null) {
        String versionName = pi.versionName == null ? "null"
            : pi.versionName;
        String versionCode = pi.versionCode + "";
        info.put("versionName", versionName);
        info.put("versionCode", versionCode);
      }
    } catch (NameNotFoundException e) {
      e.printStackTrace();
    }

    Field[] fields = Build.class.getDeclaredFields();// 反射机制
    for (Field field : fields) {
      try {
        field.setAccessible(true);
        info.put(field.getName(), field.get("").toString());
        Log.d(TAG, field.getName() + ":" + field.get(""));
      } catch (IllegalArgumentException e) {
        e.printStackTrace();
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      }
    }
  }

  private String saveCrashInfo2File(Throwable ex) {
    StringBuffer sb = new StringBuffer();
    for (Map.Entry<String, String> entry : info.entrySet()) {
      String key = entry.getKey();
      String value = entry.getValue();
      sb.append(key + "=" + value + "\r\n");
    }
    Writer writer = new StringWriter();
    PrintWriter pw = new PrintWriter(writer);
    ex.printStackTrace(pw);
    Throwable cause = ex.getCause();
    // 循环着把所有的异常信息写入writer中
    while (cause != null) {
      cause.printStackTrace(pw);
      cause = cause.getCause();
    }
    pw.close();// 记得关闭
    String result = writer.toString();
    sb.append(result);
    // 保存文件
    long timetamp = System.currentTimeMillis();
    String time = format.format(new Date());
    String fileName = "crash-" + time + "-" + timetamp + ".txt";
    if (Environment.getExternalStorageState().equals(
        Environment.MEDIA_MOUNTED)) {
      try {
        File dir = new File(Environment.getExternalStorageDirectory()
            + "/jianshu_crash/");
        Log.i("CrashHandler", dir.toString());
        if (!dir.exists())
          dir.mkdir();
        FileOutputStream fos = new FileOutputStream(dir + "/"
            + fileName);
        fos.write(sb.toString().getBytes());
        fos.close();
        return fileName;
      } catch (FileNotFoundException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return null;
  }
}