Android应用崩溃后异常捕获并重启并写入日志
在Android开发时，有时会因为一些异常导致应用报错，偶尔会因为错误 而崩溃，导致用户体验下降，为了解决这问题，我们就要对这样的异常处理：
代码如下：
CrashHandler.java
import android.content.Context;
import android.content.Intent;
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.Looper;
import android.util.Log;
import android.widget.Toast;
import com......activity.SplashActivity;
import com.......util.ImgClipUtil;
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.Map;
/**
* UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
*
* @author user
*
*/
public class CrashHandler implements UncaughtExceptionHandler {
public static final String TAG = "CrashHandler";
// CrashHandler 实例
private static CrashHandler INSTANCE = new CrashHandler();
// 程序的 Context 对象
private Context mContext;
// 系统默认的 UncaughtException 处理类
private Thread.UncaughtExceptionHandler mDefaultHandler;
// 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) {
//删除裁剪留在缓存的照片
ImgClipUtil.deleteAllFiles(ImgClipUtil.imgClipPath);
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(2000);
} catch (InterruptedException e) {
Log.e(TAG, "error : ", e);
}
// 退出程序,注释下面的重启启动程序代码
// android.os.Process.killProcess(android.os.Process.myPid());
// System.exit(1);
// 重新启动程序，注释上面的退出程序
Intent intent = new Intent();
intent.setClass(mContext, SplashActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(intent);
android.os.Process.killProcess(android.os.Process.myPid());
}
}
/**
* 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();
Toast.makeText(mContext, "很抱歉，程序出现异常，即将退出。", Toast.LENGTH_LONG).show();
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 (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) {
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 = "/sdcard/tpages/crash/";
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) {
Log.e(TAG, "an error occured while writing file...", e);
}
return null;
}
}
MyApplication.java
/**
* Created by IT01 on 2015/10/28 0028.
*/
public class MyApplication extends Application {
/* private RefWatcher mRefwatcher;
public static RefWatcher getRefWatcher(Context context) {
MyApplication application = (MyApplication) context.getApplicationContext();
return application.mRefwatcher;
}*/
@Override
public void onCreate() {
super.onCreate();
// mRefwatcher = LeakCanary.install(this);
//cookie策略 让OkHttp接受所有的cookie
/* CookieManager cookieManager = new CookieManager();
OkHttp.setCookie(cookieManager);*/
if (Constants.Config.DEVELOPER_MODE && Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectAll().penaltyDialog().build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll().penaltyDeath().build());
}
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
CrashHandler crashHandler = CrashHandler.getInstance();
// crashHandler.init(getApplicationContext());
}
}
ImgClipUtil.java
import android.graphics.Bitmap;
import android.graphics.Matrix;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* Created by IT01 on 2015/12/14 0014.
*/
public class ImgClipUtil {
public static boolean isClip(Bitmap bit){
int w = bit.getWidth(); // 得到图片的宽，高
int h = bit.getHeight();
if((w==h)&&w<1080)return false;
return true;
}
public static int getSquareSize(Bitmap bit){
int w = bit.getWidth(); // 得到图片的宽，高
int h = bit.getHeight();
int wh = w > h ? h : w;// 裁切后所取的正方形区域边长
return wh > 1080 ? 1080 : wh;
}
public static Bitmap ScaleBitmap(Bitmap bitmap, int edgeLength)
{
if(null == bitmap || edgeLength <= 0)
{
return null ;
}
Bitmap result = bitmap;
int widthOrg = bitmap.getWidth();
int heightOrg = bitmap.getHeight();
if(widthOrg >= edgeLength && heightOrg >= edgeLength)
{
//压缩到一个最小长度是edgeLength的bitmap
int longerEdge = (int)(edgeLength * Math.max(widthOrg, heightOrg) / Math.min(widthOrg, heightOrg));
int scaledWidth = widthOrg > heightOrg ? longerEdge : edgeLength;
int scaledHeight = widthOrg > heightOrg ? edgeLength : longerEdge;
Bitmap scaledBitmap;
try{
scaledBitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledHeight, true);
}
catch(Exception e){
return null;
}
//从图中截取正中间的正方形部分。
int xTopLeft = (scaledWidth - edgeLength) / 2;
int yTopLeft = (scaledHeight - edgeLength) / 2;
try{
result = Bitmap.createBitmap(scaledBitmap, xTopLeft, yTopLeft, edgeLength, edgeLength);
scaledBitmap.recycle();
}
catch(Exception e){
return null;
}
}
return result;
}
/**
* 保存文件
* @param bm
* @param fileName
* @throws IOException
*/
public static void saveFile(Bitmap bm, String fileName) throws IOException {
String path =imgClipPath+"/"; //"/sdcard/revoeye/";
File dirFile = new File(path);
if(!dirFile.exists()){
dirFile.mkdir();
}
File myCaptureFile = new File(path + fileName);
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
}
// 旋转图片
/**
* 将图片按照某个角度进行旋转
*
* @param bm
* 需要旋转的图片
* @param degree
* 旋转角度
* @return 旋转后的图片
*/
public Bitmap rotateBitmapByDegree(Bitmap bm, int degree) {
Bitmap returnBm = null;
// 根据旋转角度，生成旋转矩阵
Matrix matrix = new Matrix();
// matrix.postRotate(degree);
matrix.setRotate(degree, (float) bm.getWidth() / 2, (float) bm.getHeight() / 2);
try {
// 将原始图片按照旋转矩阵进行旋转，并得到新的图片
returnBm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
if (returnBm == null) {
returnBm = bm;
}
if (bm != returnBm) {
bm.recycle();
}
return returnBm;
}
public static File imgClipPath =new File(Utils.getPicPath() + "img");
public static void deleteAllFiles(File root) {
File files[] = root.listFiles();
if (files != null)
for (File f : files) {
if (f.isDirectory()) { // 判断是否为文件夹
deleteAllFiles(f);
try {
f.delete();
} catch (Exception e) {
}
} else {
if (f.exists()) { // 判断是否存在
deleteAllFiles(f);
try {
f.delete();
} catch (Exception e) {
}
}
}
}
}
}
