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我有一个使用 Libgdx 游戏引擎的 Android 游戏。我有一个扩展 Libgdx 的 AndroidApplication 类的 Android 活动 (mAndroidLauncher)。有一种方法可以创建 Android 警报对话框：

mAndroidLauncher.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        AlertDialog.Builder builder = new AlertDialog.Builder(mAndroidLauncher.getContext());
        builder.setTitle("Notice");
        builder.setMessage("Alert!!!");
        builder.setNeutralButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
               //OK
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }
});

我在 Google Play 开发者控制台中发生了如下崩溃：

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:208)
at android.os.Handler.<init>(Handler.java:122)
at android.app.Dialog.<init>(Dialog.java:109)
at android.app.AlertDialog.<init>(AlertDialog.java:114)
at android.app.AlertDialog$Builder.create(AlertDialog.java:931)
at com.google.android.gms.common.e.a(Unknown Source)
at com.google.android.gms.common.e.a(Unknown Source)
at com.my.game.l.a(Unknown Source)
at com.my.game.l.g(Unknown Source)
at com.my.game.l.c(Unknown Source)
at com.my.game.a.b(Unknown Source)
at com.my.game.b.f.a(Unknown Source)
at com.my.game.q.b(Unknown Source)
at com.badlogic.gdx.backends.android.i.onDrawFrame(Unknown Source)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1557)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1263)

这是我的应用程序中唯一使用 AlertDialog 的地方，这就是为什么我确信这是导致崩溃的方法。为什么 runOnUiThread 会导致此错误？我是否需要做任何其他事情来确保 AlertDialog 是从带有 looper 的线程构建的？

编辑：感谢CommonsWare。该错误确实来自 Google Play 服务。具体来说，我调用了未包含在 runOnUiThread() 中的 gameHelper.beginUserInitiatedSignIn()。虽然奇怪的是，这并没有导致所有手机都出错

4

2 回答 2

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您不能直接使用 Activity 名称调用 runOnUIThread(){}，例如调用静态方法...在 mAndroidLauncher 中声明一个对象为

public static Activity acitivity = this;

并调用 runOnUIThread 作为

mAndroidLauncher.activity.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        AlertDialog.Builder builder = new AlertDialog.Builder(mAndroidLauncher.getContext());
        builder.setTitle("Notice");
        builder.setMessage("Alert!!!");
        builder.setNeutralButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
               //OK
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }
});
于 2017-02-14T09:41:50.513 回答
0 
 new Handler(Looper.getMainLooper()).postDelayed(new Runnable()
            {
                @Override
                public void run()
                {
                    //Do something here
                    AlertDialog.Builder builder = new AlertDialog.Builder(mAndroidLauncher.getContext());
        builder.setTitle("Notice");
        builder.setMessage("Alert!!!");
        builder.setNeutralButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
               //OK
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
                }
            }, 0);
于 2016-12-06T05:49:17.033 回答