Android错误崩溃拦截

一.问题抛出

• android运行的时候难免会有一些空指针(NullPointerException)或者下标越界(IndexOutOfBoundsException),用户使用的过程操作某一个按钮的时候,就发生了崩溃.这时候可能还没有到他感兴趣的部分,程序就Crash掉了,因此导致了用户流失
• 在集成一些第三方库的时候,我们不能修改里面的实现(例如 Gson,FastJson,OkHttp,OkSocket,Glide)等,那么如果他们里面抛出异常如何解决,Glide加载图片之后填充图片时,如果Activity销毁就会造成崩溃,那么我们如何解决?

二.解决效果

预防崩溃演示效果图.gif

三.解决思路

• MainLooper一定要保证在崩溃的时候持续Loop
• 子线程发生崩溃,保证主线程Looper继续Loop
• 当绘制,测量,布局出现问题导致编舞者Crash时,应该及时处理(关闭当前异常的界面)
• 生命周期方法发生了异常,在ActivityThread里面hook其中的Instrumentation.进行代理.
• 对ActivityThread中的mH 变量添加Callback,对于不能再Instrumentation中处理的异常进行再次Catch.*大限度保证不崩溃.

四.成品Library

Github项目地址: https://github.com/xuuhaoo/DefenseCrash (欢迎Star)
集成方法:

• Please add the code into your project gradle file

classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.0'
classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'

• maven { url 'https://dl.bintray.com/xuuhaoo/maven/'}

• 

• Make sure you already done with above instructions in project gradle
  files, than you need put this into Module build.gradle file

• //崩溃预防，可以避免空指针等崩溃错误
    compile 'com.tonystark.android:defense_crash:2.0.0'

• 

We provide you two options for choosing:

• Options 1: You should manually install the defense as following code

1. public class MyApp extends Application implements IExceptionHandler {
2. @Override
3. protected void attachBaseContext(Context base) {
4. super.attachBaseContext(base);
5. // step1: Initialize the lib.
6. DefenseCrash.initialize();
7. // setp2: Install the fire wall defense.
8. DefenseCrash.install(this);
9. }
11. @Override
12. public void onCaughtException(Thread thread, Throwable throwable, boolean isSafeMode) {
13. // step3: Print the error when crashed during runtime.
14. throwable.printStackTrace();
15. // step4: Upload this throwable to your crash collection sdk.
16. }
18. @Override
19. public void onEnterSafeMode() {
20. // We enter the safe mode to keep the main looper loop after crashed.You’d better do nothing here,we just notify you.
21. }
23. @Override
24. public void onMayBeBlackScreen(Throwable throwable) {
25. // onLayout(),onMeasure() or onDraw() has breaks down,
26. // it causes the drawing to be abnormal and the choreographer to break down.
27. // We will notify you on this method,you’d better finish this activity or restart the application.
28. }
29. }

• Options 2: To facilitate some users, we provide a DefenseCrashApplication super class for you to integrate,as following code

1. public class MyApp extends DefenseCrashApplication {
2. @Override
3. public void onCaughtException(Thread thread, Throwable throwable, boolean isSafeMode) {
4. // step1: Print the error when crashed during runtime.
5. throwable.printStackTrace();
6. // step2: Upload this throwable to your crash collection sdk.
7. }
9. @Override
10. public void onEnterSafeMode() {
11. // We enter the safe mode to keep the main looper loop after crashed.You’d better do nothing here,we just notify you.
12. }
14. @Override
15. public void onMayBeBlackScreen(Throwable throwable) {
16. // onLayout(),onMeasure() or onDraw() has breaks down,
17. // it causes the drawing to be abnormal and the choreographer to break down.
18. // We will notify you on this method,you’d better finish this activity or restart the application.
19. }
20. }