FrameLayout:如何在GLSurfaceView上添加其他视图?

时间:2012-05-05 14:50:14

标签: java android android-layout android-widget

我是Andriod的新手并且很难在我的GLSurfaceView上添加控件(视图)。我希望将其添加到角落。 (比如说右下角) 最初我想添加Joystick之类的小部件,但起初我想添加“Left”,“Right”,“Top”,“Down”按钮。 我创建了一个布局XML文件,如下所示:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <View
        android:id="@+id/viewControls"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/relativeLayout1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

    <RelativeLayout
        android:id="@+id/relativeLayout1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="140dp" >
    </RelativeLayout>

    <Button
        android:id="@+id/buttonR"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/relativeLayout1"
        android:text="R" />

    <Button
        android:id="@+id/buttonL"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="L" />

</RelativeLayout>

在我的活动中,我尝试了如下:

public class MyOpenGL2Activity extends Activity {

    private GLSurfaceView mGLview;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

        mGLview=new MyOpenGL2SurfaceView(this);

        FrameLayout flayout=new FrameLayout(this);     
        flayout.addView(mGLview);

        View controller=findViewById(R.id.viewControls);

        flayout.addView(controller);       


        setContentView(flayout);
}
...

但应用程序崩溃说

  

05-05 14:40:08.015:W / dalvikvm(2258):threadid = 1:线程退出   未捕获的异常(组= 0x40a841f8)05-05 14:40:08.023:   E / AndroidRuntime(2258):致命异常:主05-05 14:40:08.023:   E / AndroidRuntime(2258):java.lang.RuntimeException:无法启动   活动ComponentInfo {ausoft.opengl / ausoft.opengl.MyOpenGL2Activity}:   java.lang.NullPointerException 05-05 14:40:08.023:   E / AndroidRuntime(2258):at   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.app.ActivityThread.access $ 600(ActivityThread.java:122)05-05   14:40:08.023:E / AndroidRuntime(2258):at   android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1146)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.os.Handler.dispatchMessage(Handler.java:99)05-05   14:40:08.023:E / AndroidRuntime(2258):at   android.os.Looper.loop(Looper.java:137)05-05 14:40:08.023:   E / AndroidRuntime(2258):at   android.app.ActivityThread.main(ActivityThread.java:4340)05-05   14:40:08.023:E / AndroidRuntime(2258):at   java.lang.reflect.Method.invokeNative(Native Method)05-05   14:40:08.023:E / AndroidRuntime(2258):at   java.lang.reflect.Method.invoke(Method.java:511)05-05 14:40:08.023:   E / AndroidRuntime(2258):at   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)05-05   14:40:08.023:E / AndroidRuntime(2258):at   dalvik.system.NativeStart.main(Native Method)05-05 14:40:08.023:   E / AndroidRuntime(2258):引起:java.lang.NullPointerException   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.view.ViewGroup.addView(ViewGroup.java:3165)05-05   14:40:08.023:E / AndroidRuntime(2258):at   android.view.ViewGroup.addView(ViewGroup.java:3152)05-05   14:40:08.023:E / AndroidRuntime(2258):at   ausoft.opengl.MyOpenGL2Activity.onCreate(MyOpenGL2Activity.java:35)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.app.Activity.performCreate(Activity.java:4465)05-05   14:40:08.023:E / AndroidRuntime(2258):at   android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)   05-05 14:40:08.023:E / AndroidRuntime(2258):at   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)   05-05 14:40:08.023:E / AndroidRuntime(2258):... 11更多

任何提示?

1 个答案:

答案 0 :(得分:2)

您正在尝试findViewById(R.id.viewControls);,但之前没有致电setContentView() ...视图viewControls在哪里?


如果需要,可以像这样创建视图

View controller = new View(this.getApplicationContext());

或其他......