安卓常用工具类-CrashHandler【错误日志获取保存工具】

注意：需要在自定义的Application的 onCreate()内进行初始化：

CrashHandler.getInstance().init(this);

package com.example.burro.demo.appframework.util;import android.content.Context;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.os.Build;import android.os.Environment;import android.os.Looper;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.Map;import java.lang.Thread.UncaughtExceptionHandler;/**错误日志保存到本地 * Created by burro on 2017/10/20. */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) {//                LogUtils.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();                ToastUtils.showToast(mContext,"很抱歉,程序出现异常,即将退出");                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 (PackageManager.NameNotFoundException e) {            LogUtils.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());                LogUtils.d(TAG, field.getName() + " : " + field.get(null));            } catch (Exception e) {                LogUtils.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 = FileUtils.getInstance().getCrashLogPath();                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) {            LogUtils.e(TAG, "an error occured while writing file...", e);        }        return null;    }}