CrashHandler.java

package studio.uphie.one.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Looper;
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.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * Created by Uphie on 2015/12/23 0023.
 * Email:uphie7@gmail.com
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler defaultHandler;
    // CrashHandler实例
    private static CrashHandler instance;
    // 程序的Context对象
    private Context context;
    // 用来存储设备信息和异常信息
    private HashMap<String,String> infos = new HashMap<>();

    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyyMMdd-HH:mm:ss-S", Locale.getDefault());

    private CrashHandler() {
    }

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


    public void init(Context ctx) {
        context = ctx;
        // 获取系统默认的UncaughtException处理器
        defaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }


    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && defaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            defaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }


    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 收集设备参数信息
        collectDeviceInfo(context);

        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(context, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();
        // 保存日志文件
        try {
            saveCatchInfo2File(ex);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }


    public void collectDeviceInfo(Context ctx) {
        try {
            //版本信息
            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);
            }
            //系统信息
            Field[] fields = Build.class.getDeclaredFields();
            for (Field field : fields) {
                    field.setAccessible(true);
                    infos.put(field.getName(), field.get(null).toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    private String saveCatchInfo2File(Throwable ex) {

        StringBuilder sb = new StringBuilder();
        for (Map.Entry entry : infos.entrySet()) {
            String key = entry.getKey().toString();
            String value = entry.getValue().toString();
            sb.append(key).append("=").append(value).append("\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 {
            String time = formatter.format(new Date());
            String fileName = "crash-" + time + ".txt";
            File dir = FileManager.getLogDir();
            FileOutputStream fos= new FileOutputStream(dir.getAbsolutePath()+"/" + fileName);
            fos.write(sb.toString().getBytes());
            fos.close();
            return fileName;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}