content: package my.project.sakuraproject.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.FileOutputStream;
  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.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.Map;
  
  public class CrashHandler implements UncaughtExceptionHandler {
  
      public static final String TAG = "CrashHandler";
  
      //系统默认的UncaughtException处理类
      private Thread.UncaughtExceptionHandler mDefaultHandler;
      //CrashHandler实例
      private static CrashHandler INSTANCE = new CrashHandler();
      //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>();
  
      //用于格式化日期,作为日志文件名的一部分
      private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
  
      /**
       * 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;
          //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;
          }
          //使用Toast来显示异常信息
          new Thread() {
              @Override
              public void run() {
                  Looper.prepare();
                  Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", 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 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) {
  
          StringBuffer sb = new StringBuffer();
          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 {
              long timestamp = System.currentTimeMillis();
              String time = formatter.format(new Date());
              String fileName = "crash-" + time + "-" + timestamp + ".log";
              if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                  String path = Environment.getExternalStorageDirectory() + "/SakuraAnime/CrashLog/";
                  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;
      }
  }
  