import android.content.Context;
import android.content.Intent;
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;
mport java.util.HashMap;
import java.util.Map;
/** * Created by TF on 2017/1/6. */
public class CrashHandlerUtil implements UncaughtExceptionHandler
 { 
   public static final String TAG = "CrashHandlerUtil";  
  // CrashHandler 实例  
 private static CrashHandlerUtil INSTANCE = new CrashHandlerUtil();   
 // 程序的 Context 对象  
  private Context mContext;   
 // 系统默认的 UncaughtException 处理类  
  private Thread.UncaughtExceptionHandler mDefaultHandler;    
// 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 CrashHandlerUtil() {
    }   
 /**     
* 获取 CrashHandler 实例 ,单例模式     
*/  
  public static CrashHandlerUtil 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,注释下面的重启启动程序代码
//        android.os.Process.killProcess(android.os.Process.myPid());
//            System.exit(1);            
// 重新启动程序，注释上面的退出程序            
Intent intent = new Intent();            
intent.setClass(mContext, StartActivity.class);            
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | 
Intent.FLAG_ACTIVITY_NEW_TASK);            
mContext.startActivity(intent);            
android.os.Process.killProcess(android.os.Process.myPid());        
}    
}    
/**    
 * 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，即将重启。", 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 = "/sdcard/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;
    }
}