package com.yuyh.utils;
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 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.HashMap;
import java.util.Map;
public class CrashHandler implements UncaughtExceptionHandler {
//系统默认的UncaughtException处理类
private Thread.UncaughtExceptionHandler mDefaultHandler;
//CrashHandler实例
private static CrashHandler INSTANCE;
//程序的Context对象
private Context mContext;
//用来存储设备信息和异常信息
private Map infos = new HashMap();
private CrashHandler() {
}
public static CrashHandler getInstance() {
if (INSTANCE == null)
INSTANCE = new CrashHandler();
return INSTANCE;
}
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);
}
@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(e.toString());
}
//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(mContext);
//保存日志文件
saveCrashInfo2File(ex);
return true;
}
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) {
LogUtils.e("CrashHandleran.NameNotFoundException---> 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());
} catch (Exception e) {
LogUtils.e("CrashHandler.NameNotFoundException---> an error occured when collect crash info", e);
}
}
}
private String saveCrashInfo2File(Throwable ex) {
StringBuffer sb = new StringBuffer();
sb.append("---------------------sta--------------------------");
for (Map.Entry 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);
sb.append("--------------------end---------------------------");
LogUtils.e(sb.toString());
return null;
}
}
然后我们在Application中，对CrashHandler进行初始化。
import android.app.Application;
import android.content.Context;
import com.yuyh.utils.CrashHandler;
public class App extends Application {
public static Context mContext;
@Override
public void onCreate() {
super.onCreate();
CrashHandler crashHandler = CrashHandler.getInstance();
crashHandler.init(getApplicationContext());
mContext = this;
}
}
这样的话，当程序代码中并未捕获异常，但发生了异常的时候，就会交由CrashHandler进行处理，异常信息可以保存到日志文件中。日志文件记录请参考：Android 日志打印工具类 可显示打印所在的方法和行号
这样子，就能把异常信息及其异常发生所在的位置，保存在日志文件中。