Android捕获应用的异常信息-封装的很好的工具类

该异常捕获类包含了应用名，异常时间以及重要的异常信息，十分实用。

1.创建类CrashHandler.java

package com.qhcloud.filetransfer.utils;import android.Manifest;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.util.Log;import com.qhcloud.filetransfer.R;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.Locale;import java.util.Map;public class CrashHandler implements UncaughtExceptionHandler {    public static final String TAG = "CrashHandler";    //存储根目录    public static final String PATH = Environment.getExternalStorageDirectory().getAbsolutePath();    // CrashHandler实例    private static CrashHandler INSTANCE = new CrashHandler();    // 是否已经初始化    private static boolean isInit = false;    // 系统默认的UncaughtException处理类    private UncaughtExceptionHandler mDefaultHandler;    // 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<>();    // 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", Locale.US);    private String nameString;    /**     * 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;        // Android M will check permission dynamically, avoid crush here.        if (!isInit && AndroidUtil.checkPermission(mContext, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)) {            // 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);            isInit = true;            nameString = context.getString(R.string.app_name);        }    }    /**     * 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;        }        // WonderMapApplication.getInstance().getSpUtil().setCrashLog(true);//        // 每次进入应用检查，是否有log，有则上传        // 使用Toast来显示异常信息        new Thread() {            @Override            public void run() {                /*                 * Looper.prepare(); Toast.makeText(mContext, * mContext.getString(R.string.crash_tip), Toast.LENGTH_LONG) * .show(); Looper.loop(); */            }        }.start();        // 收集设备参数信息        collectDeviceInfo(mContext);        // 保存日志文件        /* String fileName = */        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) {        StringBuilder sb = new StringBuilder();        for (Map.Entry<String, String> entry : infos.entrySet()) {            String key = entry.getKey();            String value = entry.getValue();            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();        // Log.d(WModel.CrashUpload, result);        sb.append(result);        try {            Log.d("CrashHandler",  "msg:"+result);            // long timestamp = System.currentTimeMillis();            String time = formatter.format(new Date());            String fileName = nameString + "-" + time + ".txt";            if (Environment.getExternalStorageState().equals(                    Environment.MEDIA_MOUNTED)) {                String path = PATH + "/projectName/log/";                File dir = new File(path);                if (!dir.exists()) {                    dir.mkdirs();                }                FileOutputStream fos = new FileOutputStream(path + fileName);                fos.write(sb.toString().getBytes());                fos.close();                onClearFile();            }            return fileName;        } catch (Exception e) {            Log.e(TAG, "an error occured while writing file...", e);        }        return null;    }    public void onClearFile() {        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            String path = PATH+ "/projectName/log/";            File file = new File(path);            if (file.exists()) {                if (file.listFiles().length > 3) {                    int index = 0;                    for (File temp : file.listFiles()) {                        long time = System.currentTimeMillis() - temp.lastModified();                        if (time/1000 > 3600*24*3) {                            temp.delete();                            index++;                        }                        if (index >= file.listFiles().length - 3) break;                    }                }            }        }    }}

稍稍修改下文中的路径PATH，项目名projectName。

2.在app程序上下文类中(继承Application的类)实例化，很简单，一句代码即可。

CrashHandler.getInstance().init(this);