Java 将GLSURFACHEVIEW设置为在有限的空间中显示

我在Android Studio和OpenGL ES上工作。 我成功地制作了一个三角形，但我不知道如何在有限的空间内显示它（即300dp x 300dp）

---

我认为setContentView（R.activity.something）；在活动中设置GLSURFACHEVIEW（布局大小：300dp x 300dp）应该可以，但不知道如何操作。

您可以使用SURFACHEVIEW创建布局，例如activity\u gl.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        tools:context=".activities.OpenGLActivity">
    <com.app.LimitedSurfaceView
        android:id="@+id/oglView"
        android:layout_width="300dp"
        android:layout_height="300dp"/>
    <!-- other elements -->
</androidx.constraintlayout.widget.ConstraintLayout>

然后在OpenGLActivity类中初始化limitedSurfaceView：

package com.app.activities

public class OpenGLActivity extends AppCompatActivity {
    private LimitedSurfaceView limitedSurfaceView;

    @Override
    protected void onCreate(Bundle state) { 
        super.onCreate(state);
        setContentView(R.layout.activity_gl);
        limitedSurfaceView = findViewById(R.id.oglView);
        limitedSurfaceView.init(this.getApplicationContext());
        ...
    } 
}

结果:

package com.app;

public class LimitedSurfaceView extends GLSurfaceView {
    private SceneRenderer renderer;

    public LimitedSurfaceView(Context context) {
        super(context);
    }

    public LimitedSurfaceView(Context context, AttributeSet attributes) {
        super(context, attributes);
    }

    public void init(Context context) {
        setPreserveEGLContextOnPause(true);
        setEGLContextClientVersion(2); // or setEGLContextClientVersion(3)
        renderer = new SceneRenderer(context);
        setRenderer(renderer);
        setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        ...
    }
}

package com.app.activities

public class OpenGLActivity extends AppCompatActivity {
    private LimitedSurfaceView limitedSurfaceView;

    @Override
    protected void onCreate(Bundle state) { 
        super.onCreate(state);
        setContentView(R.layout.activity_gl);
        limitedSurfaceView = findViewById(R.id.oglView);
        limitedSurfaceView.init(this.getApplicationContext());
        ...
    } 
}