我正在尝试为我的应用制作启动画面，然后显示注册的提醒消息，但我的应用启动显示启动画面并在alertDialog之前停止。
我知道在我的代码中，应用程序必须在选择任意两个按钮后停止，因为没有更多的工作要做，但为什么它之前停止？
这是我的代码：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Thread timerThread = new Thread() {
public void run() {
try {
sleep(3000);}
catch (InterruptedException e) {
e.printStackTrace();}
finally {
AlertDialog.Builder alert= new AlertDialog.Builder(getBaseContext());
alert.setMessage("you are not registered")
.setTitle("Alert")
.setPositiveButton("I will register", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getBaseContext(),"hello in our app",Toast.LENGTH_LONG);
}})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}}).show();
}}};
timerThread.start();
}
@Override
protected void onPause() {
super.onPause();
finish();
}
}
这是我收到的错误消息：
02-11 20:48:45.425 17071-17071/? I/art: Not late-enabling -Xcheck:jni (already on)
02-11 20:48:45.426 17071-17071/? W/art: Unexpected CPU variant for X86 using defaults: x86
02-11 20:48:45.926 17071-17071/com.project.nuha.splashforproject W/System: ClassLoader referenced unknown path: /data/app/com.project.nuha.splashforproject-1/lib/x86
02-11 20:48:45.950 17071-17071/com.project.nuha.splashforproject I/InstantRun: starting instant run server: is main process
02-11 20:48:46.241 17071-17071/com.project.nuha.splashforproject W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
02-11 20:48:46.713 17071-17108/com.project.nuha.splashforproject I/OpenGLRenderer: Initialized EGL, version 1.4
02-11 20:48:46.713 17071-17108/com.project.nuha.splashforproject D/OpenGLRenderer: Swap behavior 1
02-11 20:48:46.714 17071-17108/com.project.nuha.splashforproject W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
02-11 20:48:46.714 17071-17108/com.project.nuha.splashforproject D/OpenGLRenderer: Swap behavior 0
02-11 20:48:46.834 17071-17108/com.project.nuha.splashforproject D/EGL_emulation: eglCreateContext: 0xaa5852a0: maj 2 min 0 rcv 2
02-11 20:48:47.153 17071-17108/com.project.nuha.splashforproject D/EGL_emulation: eglMakeCurrent: 0xaa5852a0: ver 2 0 (tinfo 0xaa583210)
02-11 20:48:47.235 17071-17071/com.project.nuha.splashforproject W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
02-11 20:48:47.281 17071-17108/com.project.nuha.splashforproject D/EGL_emulation: eglMakeCurrent: 0xaa5852a0: ver 2 0 (tinfo 0xaa583210)
02-11 20:48:49.614 17071-17107/com.project.nuha.splashforproject E/AndroidRuntime: FATAL EXCEPTION: Thread-4
Process: com.project.nuha.splashforproject, PID: 17071
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.app.Dialog.<init>(Dialog.java:121)
at android.app.Dialog.<init>(Dialog.java:166)
at android.support.v7.app.AppCompatDialog.<init>(AppCompatDialog.java:46)
at android.support.v7.app.AlertDialog.<init>(AlertDialog.java:97)
at android.support.v7.app.AlertDialog$Builder.create(AlertDialog.java:929)
at android.support.v7.app.AlertDialog$Builder.show(AlertDialog.java:954)
at com.project.nuha.splashforproject.MainActivity$1.run(MainActivity.java:33)
02-11 20:48:51.135 17071-17108/com.project.nuha.splashforproject D/EGL_emulation: eglMakeCurrent: 0xaa5852a0: ver 2 0 (tinfo 0xaa583210)
答案 0 :(得分：0)
它的崩溃是因为你在非ui线程中编写了UI代码。
在 runOnUiThread
中编写显示代码的对话框Thread timerThread = new Thread()
{
public void run()
{
try
{
sleep(3000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
finally
{
runOnUiThread(new Runnable()
{
@Override
public void run()
{
AlertDialog.Builder alert = new AlertDialog.Builder(new ContextThemeWrapper(MainActivity.this, R.style.AppTheme));
alert.setMessage("you are not registered")
.setTitle("Alert")
.setPositiveButton("I will register", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
Toast.makeText(getBaseContext(), "hello in our app", Toast.LENGTH_LONG);
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
}).show();
}
});
}
}
};
timerThread.start();
如果您使用的是AppCompatActivity，请确保在使用代码时为AlertDialog上下文传递正确的样式。
例如我在这里使用了
new AlertDialog.Builder(new ContextThemeWrapper(MainActivity.this, R.style.AppTheme));