在“Thread.setDefaultUncaughtExceptionHandler”中显示一个对话框 [英] Show a dialog in `Thread.setDefaultUncaughtExceptionHandler`
问题描述
当我的Android应用程序抛出异常时，我想显示一个自定义对话框，告诉用户发生了错误，所以我使用 Thread.setDefaultUncaughtExceptionHandler 设置一个全局异常处理程序：
public class MyApplication extends Application {
@Override
public void onCreate （）{
super.onCreate（）;
Thread.setDefaultUncaughtExceptionHandler（new Thread.UncaughtExceptionHandler（）{
@Override
public void uncaughtException（Thread thread，final Throwable ex）{
AlertDialog.Builder builder =新的AlertDialog.Builder（getApplicationContext（））;
builder.setTitle（有错误）
.setMessage（应用程序将退出：+ ex.toString（））
。 setPositiveButton（OK，new DialogInterface.OnClickListener（）{
@Override
public void onClick（DialogInterface dialog，int which）{
//再次抛出
throw（RuntimeException）ex;
}
}）
.show（）;
}
}）;
}
}
但是我发现它有抛出异常， AlertDialog 不会显示，而是应用程序阻塞，一段时间后，它将显示一个系统对话框：
X应用程序没有响应。你想关闭它吗？
等待| OK
现在该怎么办？
更新
日志：
11-16 12：54：16.017：WARN / WindowManager（90）：尝试添加具有非应用程序令牌WindowToken {b38bb6a8 token = null}的窗口。中止。
似乎错误来自 new AlertDialog.Builder（getApplicationContext（） ）;
但这是应用程序子类中的异常处理程序，我如何设置一个活动实例？
你不能从这里进行任何UI操作。只需启动另一个活动/启动屏幕。传递一个额外的意图来表示在该活动中的崩溃和显示对话框。
/ *
*（非Javadoc）
*
* @see
* java.lang.Thread.UncaughtExceptionHandler＃uncaughtException（java。
* lang.Thread，java.lang.Throwable）
* /
@Override
public void uncaughtException（ Thread t，final Throwable e）{
StackTraceElement [] arr = e.getStackTrace（）;
final StringBuffer report = new StringBuffer（e.toString（））;
final String lineSeperator =------------------------------- \\\
\\\
;
report.append（DOUBLE_LINE_SEP）;
report.append（---------堆栈跟踪--------- \\\
\\\
）; （int i = 0; i< arr.length; i ++）{
report.append（）;
report.append（arr [i] .toString（））;
report.append（SINGLE_LINE_SEP）;
}
report.append（lineSeperator）;
//如果异常抛出在
// AsyncTask中的后台线程中，那么可以通过getCause
report.append（-------- - 原因--------- \\\
\\\
）;
Throwable cause = e.getCause（）;
if（cause！= null）{
report.append（cause.toString（））;
report.append（DOUBLE_LINE_SEP）;
arr = cause.getStackTrace（）; （int i = 0; i< arr.length; i ++）{
report.append（）;
report.append（arr [i] .toString（））;
report.append（SINGLE_LINE_SEP）;
}
}
//获取设备品牌，型号和sdk verion详细信息。
report.append（lineSeperator）;
report.append（---------设备--------- \\\
\\\
）;
report.append（品牌：）;
report.append（Build.BRAND）;
report.append（SINGLE_LINE_SEP）;
report.append（Device：）;
report.append（Build.DEVICE）;
report.append（SINGLE_LINE_SEP）;
report.append（Model：）;
report.append（Build.MODEL）;
report.append（SINGLE_LINE_SEP）;
report.append（Id：）;
report.append（Build.ID）;
report.append（SINGLE_LINE_SEP）;
report.append（Product：）;
report.append（Build.PRODUCT）;
report.append（SINGLE_LINE_SEP）;
report.append（lineSeperator）;
report.append（---------固件--------- \\\
\\\
）;
report.append（SDK：）;
report.append（Build.VERSION.SDK）;
report.append（SINGLE_LINE_SEP）;
report.append（Release）;
report.append（Build.VERSION.RELEASE）;
report.append（SINGLE_LINE_SEP）;
report.append（Incremental：）;
report.append（Build.VERSION.INCREMENTAL）;
report.append（SINGLE_LINE_SEP）;
report.append（lineSeperator）;
Log.e（Report ::，report.toString（））;
Intent crashedIntent = new Intent（BaseActivity.this，SplashActivity.class）;
crashedIntent.putExtra（EXTRA_CRASHED_FLAG，Unexpected Error occurred。）;
crashedIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET）;
crashedIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（crashedIntent）;
System.exit（0）;
//如果你没有在这里杀死虚拟机，这个应用程序进入僵局
}
另请参阅：
Android UncaughtExceptionHandler实例化AlertDialog中断
如果这是主线程崩溃，如何从UncaughtExceptionHandler启动活动？
我如何做：
我有一个BaseActivity扩展了Activity，而在onCreate的活动中我设置了UncaughtExceptionHandler。我的所有活动都扩展了BaseActivity而不是Activity。
键
- 您无法设置
Application.onCreate中的异常处理程序，而应创建一个BaseActivity并将其设置在onCreate方法。 - 启动SplashActivity之后，我们应该调用
System.exit（0） - 我们无法将错误实例保存到
SplashActivity中，因为它将被销毁，相反，我们可以传递一些错误消息或将其保存在文件中。
When my android application throw an exception, I want to show a custom dialog to tell user there is something wrong happened, so I use Thread.setDefaultUncaughtExceptionHandler to set a global exception handler:
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread thread, final Throwable ex) {
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
builder.setTitle("There is something wrong")
.setMessage("Application will exit：" + ex.toString())
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// throw it again
throw (RuntimeException) ex;
}
})
.show();
}
});
}
}
But I found it there is any exception thrown, the AlertDialog won't show, instead, the application blocks and after a while, it will show a system dialog:
X app is not responding. Would you like to close it?
Wait | OK
What should I do now?
UPDATE
The log:
11-16 12:54:16.017: WARN/WindowManager(90): Attempted to add window with non-application token WindowToken{b38bb6a8 token=null}. Aborting.
It seems the error is coming from new AlertDialog.Builder(getApplicationContext());
But this is an exception handler in Application subclass, how can I set an activity instance to it?
You cannot do any UI operation from here. Just start another activity/ splash screen. Pass an intent extra to denote crash and show dialog in that activity.
/*
* (non-Javadoc)
*
* @see
* java.lang.Thread.UncaughtExceptionHandler#uncaughtException(java.
* lang.Thread, java.lang.Throwable)
*/
@Override
public void uncaughtException(Thread t, final Throwable e) {
StackTraceElement[] arr = e.getStackTrace();
final StringBuffer report = new StringBuffer(e.toString());
final String lineSeperator = "-------------------------------\n\n";
report.append(DOUBLE_LINE_SEP);
report.append("--------- Stack trace ---------\n\n");
for (int i = 0; i < arr.length; i++) {
report.append( " ");
report.append(arr[i].toString());
report.append(SINGLE_LINE_SEP);
}
report.append(lineSeperator);
// If the exception was thrown in a background thread inside
// AsyncTask, then the actual exception can be found with getCause
report.append("--------- Cause ---------\n\n");
Throwable cause = e.getCause();
if (cause != null) {
report.append(cause.toString());
report.append(DOUBLE_LINE_SEP);
arr = cause.getStackTrace();
for (int i = 0; i < arr.length; i++) {
report.append(" ");
report.append(arr[i].toString());
report.append(SINGLE_LINE_SEP);
}
}
// Getting the Device brand,model and sdk verion details.
report.append(lineSeperator);
report.append("--------- Device ---------\n\n");
report.append("Brand: ");
report.append(Build.BRAND);
report.append(SINGLE_LINE_SEP);
report.append("Device: ");
report.append(Build.DEVICE);
report.append(SINGLE_LINE_SEP);
report.append("Model: ");
report.append(Build.MODEL);
report.append(SINGLE_LINE_SEP);
report.append("Id: ");
report.append(Build.ID);
report.append(SINGLE_LINE_SEP);
report.append("Product: ");
report.append(Build.PRODUCT);
report.append(SINGLE_LINE_SEP);
report.append(lineSeperator);
report.append("--------- Firmware ---------\n\n");
report.append("SDK: ");
report.append(Build.VERSION.SDK);
report.append(SINGLE_LINE_SEP);
report.append("Release: ");
report.append(Build.VERSION.RELEASE);
report.append(SINGLE_LINE_SEP);
report.append("Incremental: ");
report.append(Build.VERSION.INCREMENTAL);
report.append(SINGLE_LINE_SEP);
report.append(lineSeperator);
Log.e("Report ::", report.toString());
Intent crashedIntent = new Intent(BaseActivity.this, SplashActivity.class);
crashedIntent.putExtra(EXTRA_CRASHED_FLAG, "Unexpected Error occurred.");
crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(crashedIntent);
System.exit(0);
// If you don't kill the VM here the app goes into limbo
}
Also see:
Android UncaughtExceptionHandler that instantiates an AlertDialog breaks
Toast not showing up in UnCaughtExceptionHandler
How to start activity from UncaughtExceptionHandler if this is main thread crashed?
How i do it:
I have a BaseActivity which extends Activity, and in onCreate of the activity I set the UncaughtExceptionHandler. All my activities extend the BaseActivity instead of Activity.
Keys
- You can't set the exception handler in
Application.onCreate, instead, you should create aBaseActivityand set it on theonCreatemethod of it. - After starting the SplashActivity, we should call
System.exit(0) - We can't hold the error instance to share it to
SplashActivity, since it will be destroyed, instead, we can pass some error message or persist it in file.
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