详解Android全局异常的捕获处理

package hi.xiaoyu.crashhandler;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Date;

import android.content.Context;
import android.os.Environment;
import android.util.Log;

public class CrashHandler implements UncaughtExceptionHandler {

  private static CrashHandler instance;

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

  public void init(Context ctx) {
    Thread.setDefaultUncaughtExceptionHandler(this);
  }

  /**
   * 核心方法，当程序crash 会回调此方法， Throwable中存放这错误日志
   */
  @Override
  public void uncaughtException(Thread arg0, Throwable arg1) {

    String logPath;
    if (Environment.getExternalStorageState().equals(
        Environment.MEDIA_MOUNTED)) {
      logPath = Environment.getExternalStorageDirectory()
          .getAbsolutePath()
          + File.separator
          + File.separator
          + "log";

      File file = new File(logPath);
      if (!file.exists()) {
        file.mkdirs();
      }
      try {
        FileWriter fw = new FileWriter(logPath + File.separator
            + "errorlog.log", true);
        fw.write(new Date() + "\n");
        // 错误信息
        // 这里还可以加上当前的系统版本，机型型号 等等信息
        StackTraceElement[] stackTrace = arg1.getStackTrace();
        fw.write(arg1.getMessage() + "\n");
        for (int i = 0; i < stackTrace.length; i++) {
          fw.write("file:" + stackTrace[i].getFileName() + " class:"
              + stackTrace[i].getClassName() + " method:"
              + stackTrace[i].getMethodName() + " line:"
              + stackTrace[i].getLineNumber() + "\n");
        }
        fw.write("\n");
        fw.close();
        // 上传错误信息到服务器
        // uploadToServer();
      } catch (IOException e) {
        Log.e("crash handler", "load file failed...", e.getCause());
      }
    }
    arg1.printStackTrace();
    android.os.Process.killProcess(android.os.Process.myPid());
  }

}

CrashHandler crashHandler = CrashHandler.getInstance();
crashHandler.init(getApplicationContext());