自定义崩溃界面 CustomActivityOnCrash

项目地址：https://github.com/Ereza/CustomActivityOnCrash

The inner workings are based on ACRA's dialog reporting mode：https://github.com/ACRA/acra 

第一次见到就感觉大有用途：

• 可以在app崩溃的时候显示自定义的页面，对用户来说非常友好
  
• 可以非常方便用户再次启动我们的app，或者直接在崩溃后重启
  
• 还可以定制重启动后的Activity
• 还有一个隐藏的大功能：可以收集崩溃日志，非常方便我们调试。比如测试同事在测试时，有时候很难重现那些崩溃的bug，而这个库可以非常方便的把崩溃日志提取出来，这样对于我们定位bug大有裨益！

自定义设置

public class MyApp extends Application {
   @Override
   public void onCreate() {
      super.onCreate();
      //Install CustomActivityOnCrash
      CustomActivityOnCrash.install(this);
      CustomActivityOnCrash.setLaunchErrorActivityWhenInBackground(true);
      CustomActivityOnCrash.setShowErrorDetails(true);
      CustomActivityOnCrash.setDefaultErrorActivityDrawable(R.mipmap.ic_launcher);
      CustomActivityOnCrash.setEnableAppRestart(true);
      //The EventListener you provide can not be an anonymous or non-static inner class
      CustomActivityOnCrash.setEventListener(new MyEventListener());
      CustomActivityOnCrash.setRestartActivityClass(Activity2.class);
      //CustomActivityOnCrash.setErrorActivityClass(Activity2.class);

      //Now initialize your error handlers as normal.  i.e., ACRA.init(this);or Fabric.with(this, new Crashlytics())
   }

   private static class MyEventListener implements CustomActivityOnCrash.EventListener {
      @Override
      public void onLaunchErrorActivity() {
         Log.i("bqt", "onLaunchErrorActivity");
      }
      @Override
      public void onRestartAppFromErrorActivity() {
         Log.i("bqt", "onRestartAppFromErrorActivity");
      }
      @Override
      public void onCloseAppFromErrorActivity() {
         Log.i("bqt", "onCloseAppFromErrorActivity");
      }
   }
}

How to use

1. Add a dependency

Add the following dependency to your build.gradle:

dependencies {

    compile 'cat.ereza:customactivityoncrash:1.5.0'

}

You can also do it manually, by downloading the source code, importing the library folder as an Android Library Module, and adding a dependency on your project to that module.

2. Set up your application

On your application class, use this snippet:

    @Override

    public void onCreate() {

        super.onCreate();

        //Install CustomActivityOnCrash

        CustomActivityOnCrash.install(this);

        //Now initialize your error handlers as normal

        //i.e., ACRA.init(this); or Fabric.with(this, new Crashlytics())

    }

WARNING! If you already have ACRA, Crashlytics or any similar library in your app, it will still work as normal, but the CustomActivityOnCrash initialization MUST be done first, or the original reporting tool will stop working.

3. Test it

Make the app crash by using something like this in your code:

throw new RuntimeException("Boom!");

The error activity should show up, instead of the system dialog.

Optional: Customization

Custom behavior

You can call the following methods at any time to customize how the library works, although usually you will call them before calling install(context):

CustomActivityOnCrash.setLaunchErrorActivityWhenInBackground(boolean);

This method defines if the error activity should be launched when the app crashes while on background. By default, this is true. On API<14, it's always true since there is no way to detect查明 if the app is in foreground. If you set it to false, a crash while in background won't launch the error activity nor the system dialog, so it will be a silent crash. The default is true.

CustomActivityOnCrash.setShowErrorDetails(boolean);

This method defines if the error activity must show a button with error details. If you set it to false, the button on the default error activity will disappear, thus disabling the user from seeing the stack trace. The default is true.

CustomActivityOnCrash.setDefaultErrorActivityDrawable(int);

This method allows changing the default upside-down颠倒的 bug image with an image of your choice. You may pass a resource id for a drawable or a mipmap. The default is R.drawable.customactivityoncrash_error_image.

CustomActivityOnCrash.setEnableAppRestart(boolean);

This method defines if the error activity must show a "Restart app" button or a "Close app" button. If you set it to false, the button on the default error activity will close the app instead of restarting. The default is true.

Warning! If you set it to true, there is the possibility of it still displaying the "Close app" button, if no restart activity is specified or found! 

CustomActivityOnCrash.setEventListener(EventListener);

This method allows you to specify an event listener in order to get notified when the library shows the error activity, restarts or closes the app. The EventListener you provide can not be an anonymous or non-static inner class, because it needs to be serialized连载 by the library. The library will throw an exception if you try to set an invalid class. If you set it to null, no event listener will be invoked. The default is null.

CustomActivityOnCrash.setRestartActivityClass(Class<? extends Activity>);

This method sets the activity that must be launched by the error activity when the user presses the button to restart the app. If you don't set it (or set it to null), the library will use the first activity on your manifest that has an intent-filter with action cat.ereza.customactivityoncrash.RESTART, and if there is none, the default launchable activity on your app. If no launchable activity can be found and you didn't specify any, the "restart app" button will become a "close app" button, even if setEnableAppRestart is set to true.

As noted, you can also use the following intent-filter to specify the restart activity:

<intent-filter>
    <action android:name="cat.ereza.customactivityoncrash.RESTART" />
</intent-filter>

自定义出错时弹出的Activity

CustomActivityOnCrash.setErrorActivityClass(Class<? extends Activity>);

This method allows you to set a custom error activity to be launched, instead of the default one. Use it if you need further customization that is not just strings, colors or themes (see below). If you don't set it (or set it to null), the library will use the first activity on your manifest that has an intent-filter with action cat.ereza.customactivityoncrash.ERROR, and if there is none, a default error activity from the library. If you use this, the activity must be declared in your AndroidManifest.xml, with process set to: error_activity.

Example:

<activity
    android:name="cat.ereza.sample.customactivityoncrash.activity.CustomErrorActivity"
    android:label="@string/error_title"
    android:process=":error_activity" />

As noted, you can also use the following intent-filter to specify the error activity:

<intent-filter>
    <action android:name="cat.ereza.customactivityoncrash.ERROR" />
</intent-filter>

Customization of the default activity

You can override several resources to customize the default activity:

Theme:

You can override the default error activity theme by defining a theme in your app with the following id: CustomActivityOnCrashTheme

Image:

By default, an image of a bug is displayed. You can change it to any image by creating a customactivityoncrash_error_image drawable on all density buckets (mdpi, hdpi, xhdpi, xxhdpi and xxxhdpi). You can also use the provided CustomActivityOnCrash.setDefaultErrorActivityDrawable(int) method.

Strings:

You can provide new strings and translations for the default error activity strings by overriding the following strings:

<string name="customactivityoncrash_error_activity_error_occurred_explanation">An unexpected error occurred.</string>
<string name="customactivityoncrash_error_activity_unknown_exception">Unknown exception</string>
<string name="customactivityoncrash_error_activity_restart_app">Restart app</string>
<string name="customactivityoncrash_error_activity_close_app">Close app</string>
<string name="customactivityoncrash_error_activity_error_details">Error details</string>
<string name="customactivityoncrash_error_activity_error_details_title">Error details</string>
<string name="customactivityoncrash_error_activity_error_details_close">Close</string>
<string name="customactivityoncrash_error_activity_error_details_copy">Copy to clipboard</string>
<string name="customactivityoncrash_error_activity_error_details_copied">Copied to clipboard</string>
<string name="customactivityoncrash_error_activity_error_details_clipboard_label">Error information</string>

There is a sample project module with examples of these overrides. If in doubt存在疑问, check the code in that module.

Completely custom error activity

If you choose to create your own completely custom error activity, you can use these methods:

CustomActivityOnCrash.getStackTraceFromIntent(getIntent());

Returns the stack trace that caused the error as a string.

CustomActivityOnCrash.getAllErrorDetailsFromIntent(getIntent());

Returns several error details including the stack trace that caused the error, as a string. This is used in the default error activity error details dialog.

CustomActivityOnCrash.getRestartActivityClassFromIntent(getIntent());

Returns the class of the activity you have to launch to restart the app, or null if not set.

CustomActivityOnCrash.getEventListenerFromIntent(getIntent());

Returns the event listener that you must pass to restartApplicationWithIntent(activity, intent, eventListener) or closeApplication(activity, eventListener).

CustomActivityOnCrash.restartApplicationWithIntent(activity, intent, eventListener);

Kills the current process and restarts the app again with an startActivity() to the passed intent. You MUST call this to restart the app, or you will end up having several Application class instances and experience multiprocess issues in API<17.

CustomActivityOnCrash.closeApplication(activity, eventListener);

Closes the app and kills the current process. You MUST call this to close the app, or you will end up having several Application class instances and experience multiprocess issues in API<17.

The sample project module includes an example of a custom error activity. If in doubt, check the code in that module.

Using Proguard? 混淆

No need to add special rules, the library should work even with即使 obfuscation混淆.

Inner workings 工作原理

This library relies on依靠 the Thread.setDefaultUncaughtExceptionHandler method. When an exception is caught by the library's UncaughtExceptionHandler it does the following:

• Captures捕获 the stack trace that caused the crash
  
• Launches a new intent to the error activity passing the stacktrace as an extra.
  
• Kills the current process.
  

The inner workings are based on ACRA's dialog reporting mode with some minor tweaks小的调整. Look at the code if you need more detail about how it works.

Incompatibilities 兼容性

• CustomActivityOnCrash will not work in these cases:
  
• With any custom UncaughtExceptionHandler set after initializing初始化 the library, that does not call back to the original handler.
• With ACRA enabled and reporting mode set to TOAST or DIALOG.
• If you use a custom UncaughtExceptionHandler, it will not be called if you initialize it before the library initialization (so, Crashlytics or ACRA initialization must be done after CustomActivityOnCrash initialization).
  
• On some rare特殊的 cases on devices with API<14, the app may enter a restart loop when a crash occurs. Therefore, using it on API<14 is not recommended.
  
• If your app initialization or error activity crash, there is a possibility of entering an infinite无限的 restart loop (this is checked by the library for the most common cases, but could happen in rarer cases).
  
• The library has not been tested with multidex enabled. It uses Class.forName() to load classes, so maybe that could cause some problem in API<21. If you test it with such configuration, please provide feedback反馈!
  
• The library has not been tested with multiprocess多进程 apps. If you test it with such configuration, please provide feedback too!
  

Disclaimers 免责声明

• This will not avoid ANRs from happening.
  
• This will not catch native errors.
  
• There is no guarantee保证 that this will work on every device.
  
• This library will not make you toast for breakfast早餐 :)  这估计是老美的冷笑话
  

Contributing & license

Any contribution in order to make this library better will be welcome!

The library is licensed under the Apache License 2.0.