android开发中经常会遇到程序异常,而已常常会遇到一出现异常APP就自动重启了,而已如果你的项目中应用到Fragment的切换的话,会出行页面重叠的现象。今天为了解决这个问题看了不少大牛的博客。最后终于把问题解决了,下面就把解决的方法做一个介绍。
总的问题解决定向是处理崩溃异常的方法。先说说我前面尝试的不成功的方法。
一、写一个类实现UncaughtExceptionHandler 接口
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;
/**
* Created by willkong on 2016/12/14.
*/
public class UnCeHandler implements Thread.UncaughtExceptionHandler {
private Thread.UncaughtExceptionHandler mDefaultHandler;
public static final String TAG = "CatchExcep";
MyApplication application;
public UnCeHandler(MyApplication application){
//获取系统默认的UncaughtException处理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
this.application = application;
}
@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(2000);
}catch (InterruptedException e){
Log.e(TAG, "error : ", e);
}
Intent intent = new Intent(application.getApplicationContext(), MainActivity.class);
PendingIntent restartIntent = PendingIntent.getActivity(
application.getApplicationContext(), 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK);
//退出程序
AlarmManager mgr = (AlarmManager)application.getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 1000,
restartIntent); // 1秒钟后重启应用
application.finishActivity();
}
}
/**
* 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;否则没有处理返回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(application.getApplicationContext(), "很抱歉,程序出现异常,即将退出.",
Toast.LENGTH_SHORT).show();
Looper.loop();
}
}.start();
return true;
}
}
二、通过在android Application 这个全局类中处理异常,一般我们都会重写一个我们自己的Application继承Application。
import android.app.Activity;
import android.app.Application;
import java.util.ArrayList;
/**
* Created by willkong on 2016/12/14.
*/
public class MyApplication extends Application {
ArrayList list = new ArrayList();
@Override
public void onCreate() {
super.onCreate();
//设置该CrashHandler为程序的默认处理器
UnCeHandler catchExcep = new UnCeHandler(this);
Thread.setDefaultUncaughtExceptionHandler(catchExcep);
}
/**
* Activity关闭时,删除Activity列表中的Activity对象*/
public void removeActivity(Activity a){
list.remove(a);
}
/**
* 向Activity列表中添加Activity对象*/
public void addActivity(Activity a){
list.add(a);
}
/**
* 关闭Activity列表中的所有Activity*/
public void finishActivity(){
for (Activity activity : list) {
if (null != activity) {
activity.finish();
}
}
//杀死该应用进程
android.os.Process.killProcess(android.os.Process.myPid());
}
}
人为的制造一个异常
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button btn;
TextView tv;
private MyApplication application;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.btn);
tv = (TextView)findViewById(R.id.tv);
application = (MyApplication) getApplication();
application.addActivity(this);
btn.setOnClickListener(this);
}
/**
* 人为制造的异常*/
public void press(){
new Thread(new Runnable() {
@Override
public void run() {
tv.setText("dfsd");
}
}).start();
}
@Override
public void onClick(View v) {
press();
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.testapplication.MainActivity">
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
LinearLayout>
尝试二:
通用 application
1、收集所有 avtivity 用于彻底退出应用
2、捕获崩溃异常,保存错误日志,并重启应用
public class HKBaseApplication extends Application {
// activity对象列表,用于activity统一管理
private List activityList;
// 异常捕获
protected boolean isNeedCaughtExeption = true;// 是否捕获未知异常
private PendingIntent restartIntent;
private MyUncaughtExceptionHandler uncaughtExceptionHandler;
private String packgeName;
@Override
public void onCreate() {
super.onCreate();
activityList = new ArrayList();
packgeName = getPackageName();
if (isNeedCaughtExeption) {
cauchException();
}
}
// -------------------异常捕获-----捕获异常后重启系统-----------------//
private void cauchException() {
Intent intent = new Intent();
// 参数1:包名,参数2:程序入口的activity
intent.setClassName(packgeName, packgeName + ".LoginActivity");
restartIntent = PendingIntent.getActivity(getApplicationContext(), -1, intent,
Intent.FLAG_ACTIVITY_NEW_TASK);
// 程序崩溃时触发线程
uncaughtExceptionHandler = new MyUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(uncaughtExceptionHandler);
}
// 创建服务用于捕获崩溃异常
private class MyUncaughtExceptionHandler implements UncaughtExceptionHandler {
@Override
public void uncaughtException(Thread thread, Throwable ex) {
// 保存错误日志
saveCatchInfo2File(ex);
// 1秒钟后重启应用
AlarmManager mgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent);
// 关闭当前应用
finishAllActivity();
finishProgram();
}
};
/**
* 保存错误信息到文件中
*
* @return 返回文件名称
*/
private String saveCatchInfo2File(Throwable ex) {
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 sb = writer.toString();
try {
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
String time = formatter.format(new Date());
String fileName = time + ".txt";
System.out.println("fileName:" + fileName);
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String filePath = Environment.getExternalStorageDirectory() + "/HKDownload/" + packgeName
+ "/crash/";
File dir = new File(filePath);
if (!dir.exists()) {
if (!dir.mkdirs()) {
// 创建目录失败: 一般是因为SD卡被拔出了
return "";
}
}
System.out.println("filePath + fileName:" + filePath + fileName);
FileOutputStream fos = new FileOutputStream(filePath + fileName);
fos.write(sb.getBytes());
fos.close();
//文件保存完了之后,在应用下次启动的时候去检查错误日志,发现新的错误日志,就发送给开发者
}
return fileName;
} catch (Exception e) {
System.out.println("an error occured while writing file..." + e.getMessage());
}
return null;
}
// ------------------------------activity管理-----------------------//
// activity管理:从列表中移除activity
public void removeActivity(Activity activity) {
activityList.remove(activity);
}
// activity管理:添加activity到列表
public void addActivity(Activity activity) {
activityList.add(activity);
}
// activity管理:结束所有activity
public void finishAllActivity() {
for (Activity activity : activityList) {
if (null != activity) {
activity.finish();
}
}
}
// 结束线程,一般与finishAllActivity()一起使用
// 例如: finishAllActivity;finishProgram();
public void finishProgram() {
android.os.Process.killProcess(android.os.Process.myPid());
}
}
异常捕获 简单用法介绍:
public class MyApplication extends Application implements
Thread.UncaughtExceptionHandler {
@Override
public void onCreate() {
super.onCreate();
//设置Thread Exception Handler
Thread.setDefaultUncaughtExceptionHandler(this);
}
@Override
public void uncaughtException(Thread thread, Throwable ex) {
System.out.println("uncaughtException");
System.exit(0);
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
}
以上的尝试方法都没有成功,下面的一种方式成功了。
步骤一、在你自己的Application类的onCreate()方法下 加入代码捕获异常,并且处理异常。Thread.setDefaultUncaughtExceptionHandler(restartHandler); // 程序崩溃时触发线程 以下用来捕获程序崩溃异常
@Override
public void onCreate() {
super.onCreate();
Thread.setDefaultUncaughtExceptionHandler(restartHandler); // 程序崩溃时触发线程 以下用来捕获程序崩溃异常
}
步骤二、 编写方法创建服务用于捕获崩溃异常并且处理
// 创建服务用于捕获崩溃异常
private UncaughtExceptionHandler restartHandler = new UncaughtExceptionHandler() {
public void uncaughtException(Thread thread, Throwable ex) {
restartApp();//发生崩溃异常时,重启应用
}
};
//重启App
public void restartApp(){
Intent intent = new Intent(this,MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
android.os.Process.killProcess(android.os.Process.myPid()); //结束进程之前可以把你程序的注销或者退出代码放在这段代码之前
}
成功解决问题。