我的设置如下:TabHost有两个子活动,每个活动都有一个GLSurfaceView作为内容。这两个活动当然是将onPause()和onResume()事件转发给他们的GLSurfaceViews。
第一个Activity按预期工作,但切换到另一个选项卡没有视觉效果。 LogCat显示onSurfaceCreated(),onSurfaceChanged()和onSurfaceDraw()都在GLSurfaceView实例上按预期调用。
“修复”是分别使用onPause()和onResume()中的setVisibility(View.INVISIBLE / VISIBLE)设置每个GLSurfaceView的可见性。这会导致显示正确的视图,但在更改选项卡时会产生闪烁效果的缺点。当GLSurfaceView完成更多工作时,这一点尤其明显。
基本上,我怎样才能避免设置GLSurfaceViews的可见性?
TabActivity:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainactivity);
TabHost tabHost = getTabHost();
TabHost.TabSpec spec;
Intent intent;
// First Vortex view
intent = new Intent().setClass(this, VortexActivity.class);
spec = tabHost.newTabSpec("A")
.setIndicator("A")
.setContent(intent);
tabHost.addTab(spec);
// Second Vortex view
intent = new Intent().setClass(this, VortexActivity.class);
spec = tabHost.newTabSpec("B")
.setIndicator("B")
.setContent(intent);
tabHost.addTab(spec);
}
儿童活动:
public class VortexActivity extends Activity {
private GLSurfaceView view;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
view = new GLSurfaceView(this);
view.setRenderer(new VortexRenderer());
setContentView(view);
}
@Override
public void onResume() {
super.onResume();
view.onResume();
//view.setVisibility(View.VISIBLE);
}
@Override
public void onPause() {
super.onPause();
view.onPause();
//view.setVisibility(View.INVISIBLE);
}
}
渲染器:
public class VortexRenderer implements GLSurfaceView.Renderer {
public void onSurfaceCreated(GL10 glArgument, EGLConfig config) {
}
public void onSurfaceChanged(GL10 gl, int w, int h) {
}
public void onDrawFrame(GL10 gl) {
long ms = System.currentTimeMillis() % 2000;
if(ms > 1000)
ms = 1000 - (ms - 1000);
float intensity = ms / 500.0f;
gl.glClearColor(intensity, intensity, intensity, 1.0f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
}
}
布局:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="0dp" >
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:padding="0dp" />
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:padding="0dp" />
</LinearLayout>
答案 0 :(得分:0)
另一个解决方法是拥有一个始终可见的GLSurfaceView,并让它切换显示的内容。