这个时候程序就正常运行了，是不是很简单啊，但这种情况是自己在开发中调试运行时可以通过logcat来定位问题，但如果产品上线之后你怎么办，用户都是小白哦，可不会给你提供错误日志，这个就是本篇文章要讲的重点，如果要让我们自己记录错误日志，怎么做？
通过UncaughtExceptionHandler来记录dump异常日志
package com.devilwwj.androidcrashdemo;
/**
-
com.devilwwj.androidcrashdemo
-
Created by devilwwj on 16/5/27.
*/
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.os.Process;
import android.util.Log;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.Thread.UncaughtExceptionHandler;
import java.text.SimpleDateFormat;
import java.util.Date;
public class CrashHandler implements UncaughtExceptionHandler {
private static final String TAG = “CrashHandler”;
private static final boolean DEBUG = true;
private static final String PATH = Environment
.getExternalStorageDirectory() + “/CrashDemo/log/”;
private static final String FILE_NAME = “crash”;
private static final String FILE_NAME_SUFFIX = “.trace”;
private static final String ABOLUTE_PATH = PATH + FILE_NAME + FILE_NAME_SUFFIX;
private String deviceToken;
private static CrashHandler sInstance = new CrashHandler();
private UncaughtExceptionHandler mDefaultCrashHandler;
private Context mContext;
private CrashHandler() {
}
public static CrashHandler getInstance() {
return sInstance;
}
public void init(Context context) {
mDefaultCrashHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
mContext = context.getApplicationContext();
}
/**
-
这个是最关键的函数，当程序中有未被捕获的异常，系统将会自动调用#uncaughtException方法
-
thread为出现未捕获异常的线程，ex为未捕获的异常，有了这个ex，我们就可以得到异常信息。
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
try {
// 导出异常信息到SD卡中
dumpExceptionToSDCard(ex);
} catch (IOException e) {
e.printStackTrace();
}
ex.printStackTrace();
// 如果系统提供了默认的异常处理器，则交给系统去结束我们的程序，否则就由我们自己结束自己
if (mDefaultCrashHandler != null) {
mDefaultCrashHandler.uncaughtException(thread, ex);
} else {
Process.killProcess(Process.myPid());
}
}
private File dumpExceptionToSDCard(Throwable ex) throws IOException {
// 如果SD卡不存在或无法使用，则无法把异常信息写入SD卡
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
if (DEBUG) {
Log.w(TAG, “sdcard unmounted,skip dump exception”);
return null;
}
}
File dir = new File(PATH);
if (!dir.exists()) {
dir.mkdirs();
}
long current = System.currentTimeMillis();
String time = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”)
.format(new Date(current));
// File file = new File(PATH + FILE_NAME + time + “_”+ deviceToken +
// FILE_NAME_SUFFIX);
File file = new File(PATH + FILE_NAME + FILE_NAME_SUFFIX);
if (!file.exists()) {
file.createNewFile();
} else {
try {
// 追加内容
PrintWriter pw = new PrintWriter(new BufferedWriter(
new FileWriter(file, true)));
pw.println(time);
dumpPhoneInfo(pw);
pw.println();
ex.printStackTrace(pw);
pw.println("---------------------------------分割线----------------------------------");
pw.println();
pw.close();
} catch (Exception e) {
Log.e(TAG, “dump crash info failed”);
}
}
return file;
}
private void dumpPhoneInfo(PrintWriter pw) throws NameNotFoundException {
PackageManager pm = mContext.getPackageManager();
PackageInfo pi = pm.getPackageInfo(mContext.getPackageName(),
PackageManager.GET_
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ACTIVITIES);
pw.print("App Version: ");
pw.print(pi.versionName);
pw.print(’_’);
pw.println(pi.versionCode);
// android版本号
pw.print("OS Version: ");
pw.print(Build.VERSION.RELEASE);
pw.print("_");
pw.println(Build.VERSION.SDK_INT);
// 手机制造商
pw.print("Vendor: ");
pw.println(Build.MANUFACTURER);
// 手机型号
pw.print("Model: ");
pw.println(Build.MODEL);
// cpu架构
pw.print("CPU ABI: ");
pw.println(Build.CPU_ABI);
}
/**
-
提供方法上传异常信息到服务器
-
@param log
*/
private void uploadExceptionToServer(File log) {
// TODO Upload Exception Message To Your Web Server
}