[英]My App Keeps Crashing When I Try to Create an Open GL ES Enviroment
我正在关注有关如何使用图形创建自己的Open GL ES环境的android教程。 除了似乎本教程正在跳过他们认为我们知道要包含的代码这一事实之外,我还在使我的应用保持打开状态而没有错误消息的问题,“不幸的是,MyApp已停止”五秒钟该应用程序将打开。 我不认为是三角形类引起的,因为我注释掉了三角形对象并试图再次运行它,但是发生了同样的事情。 我还包括了清单中也应包含的必要代码。
这是我的代码(Open GL ES代码在虚线之间):
public class MainActivity extends ActionBarActivity {
private GLSurfaceView mGLView;
private GLSurfaceView.Renderer MyRenderer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGLView=new MyGLSurfaceView(this);
setContentView(mGLView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
//....................................................................................................
class MyGLSurfaceView extends GLSurfaceView{
public MyGLSurfaceView(Context context){
super(context);
MyRenderer=new MyGlRenderer();
setRenderer(MyRenderer);
setEGLContextClientVersion(2);
setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
}
}
//Triangle mTriangle;
public class MyGlRenderer implements GLSurfaceView.Renderer{
@Override
public void onSurfaceCreated(GL10 unused, EGLConfig config){
GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
//mTriangle= new Triangle();
}
@Override
public void onDrawFrame(GL10 unused){
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
//mTriangle.draw();
}
@Override
public void onSurfaceChanged(GL10 unused, int width, int height){
GLES20.glViewport(0,0,width,height);
}
}
public class Triangle{
private FloatBuffer vertexBuffer;
static final int COORDS_PER_VERTEX=3;
float triangleCoords[]={
0.0f, 0.622008459f, 0.0f,//top
-0.5f, -0.311004243f, 0.0f, //bottom left
0.5f, -0.311004242f,0.0f//bottom right
};
int mProgram;
float color[] = { 0.63671875f, 0.76953125f, 0.22265625f, 1.0f };
private final String vertexShaderCode =
"attribute vec4 vPosition;" +
"void main() {" +
" gl_Position = vPosition;" +
"}";
private final String fragmentShaderCode =
"precision mediump float;" +
"uniform vec4 vColor;" +
"void main() {" +
" gl_FragColor = vColor;" +
"}";
public Triangle(){
ByteBuffer bb=ByteBuffer.allocateDirect(
triangleCoords.length*4);
bb.order(ByteOrder.nativeOrder());
vertexBuffer=bb.asFloatBuffer();
vertexBuffer.put(triangleCoords);
vertexBuffer.position(0);
int vertexShader=loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
int fragmentShader=loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
mProgram=GLES20.glCreateProgram();
GLES20.glAttachShader(mProgram, vertexShader);
GLES20.glAttachShader(mProgram, fragmentShader);
GLES20.glLinkProgram(mProgram);
}
public int loadShader(int type, String shaderCode){
int shader=GLES20.glCreateShader(type);
GLES20.glShaderSource(shader, shaderCode);
GLES20.glCompileShader(shader);
return shader;
}
static final int vertexStride = COORDS_PER_VERTEX * 3;
static final int vertexCount = 3;
public void draw(){
GLES20.glUseProgram(mProgram);
int mPositionHandle= GLES20.glGetAttribLocation(mProgram, "vPosition");
GLES20.glEnableVertexAttribArray(mPositionHandle);
GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
GLES20.GL_FLOAT, false,
vertexStride, vertexBuffer);
int mColorHandle=GLES20.glGetUniformLocation(mProgram,"vColor");
GLES20.glUniform4fv(mColorHandle, 1, color,0);
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vertexCount);
GLES20.glDisableVertexAttribArray(mPositionHandle);
}
}
//....................................................................................................
}
这是需要日志的人的日志行为:
06-23 11:44:30.385: D / ActivityThread(27794):setTargetHeapUtilization:0.25 06-23 11:44:30.385: D / ActivityThread(27794):setTargetHeapIdealFree:8388608 06-23 11:44:30.385: D / ActivityThread (27794):setTargetHeapConcurrentStart:2097152 06-23 11:44:30.535: W / dalvikvm(27794):threadid = 1:线程退出且未捕获异常(group = 0x40ee7438)06-23 11:44:30.535: E / AndroidRuntime( 27794):致命异常:主06-23 11:44:30.535: E / AndroidRuntime(27794):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.myapp5 / com.example.myapp5.MainActivity}: java.lang.IllegalStateException:已为此实例调用setRenderer。 06-23 11:44:30.535: E / AndroidRuntime(27794):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)06-23 11:44:30.535: E / AndroidRuntime(27794):在Android。 app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)06-23 11:44:30.535: E / AndroidRuntime(27794):at android.app.ActivityThread.access $ 700(ActivityThread.java:143)06-23 11:44 :30.535: E / AndroidRuntime(27794):位于android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1241)06-23 11:44:30.535: E / AndroidRuntime(27794):位于android.os.Handler。 dispatchMessage(Handler.java:99)06-23 11:44:30.535: E / AndroidRuntime(27794):位于android.os.Looper.loop(Looper.java:137)06-23 11:44:30.535: E / AndroidRuntime(27794):位于android.app.ActivityThread.main(ActivityThread.java:4953)06-23 11:44:30.535: E / AndroidRuntime(27794):位于java.lang.reflect.Method.invokeNative(本机方法) 06-23 11:44:30.535: E / AndroidRuntime(27794):at java.lang.reflect.Method.invoke(Method.java:511)06-23 11:44:30.535: E / And roidRuntime(27794):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1004)06-23 11:44:30.535: E / AndroidRuntime(27794):在com.android.internal.os .ZygoteInit.main(ZygoteInit.java:771)06-23 11:44:30.535: E / AndroidRuntime(27794):at dalvik.system.NativeStart.main(Native Method)06-23 11:44:30.535: E / AndroidRuntime(27794):原因:java.lang.IllegalStateException:已为此实例调用setRenderer。 06-23 11:44:30.535: E / AndroidRuntime(27794):在android.opengl.GLSurfaceView.checkRenderThreadState(GLSurfaceView.java:1810)06-23 11:44:30.535: E / AndroidRuntime(27794):在android。 opengl.GLSurfaceView.setEGLContextClientVersion(GLSurfaceView.java:472)06-23 11:44:30.535: E / AndroidRuntime(27794):at com.example.myapp5.MainActivity $ MyGLSurfaceView。(MainActivity.java:80)06-23 11 :44:30.535: E / AndroidRuntime(27794):在com.example.myapp5.MainActivity.onCreate(MainActivity.java:31)06-23 11:44:30.535: E / AndroidRuntime(27794):在android.app。 Activity.performCreate(Activity.java:5160)06-23 11:44:30.535: E / AndroidRuntime(27794):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)06-23 11:44:30.535: E / AndroidRuntime(27794):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)06-23 11:44:30.535: E / AndroidRuntime(27794):...还有11个
如文档中所指定,需要在setRenderer()
之前调用setEGLContextClientVersion()
: http : //developer.android.com/reference/android/opengl/GLSurfaceView.html#setEGLContextClientVersion setRenderer()
setEGLContextClientVersion()
) 。
在复制的堆栈跟踪中还存在一个问题提示:
java.lang.IllegalStateException:已为此实例调用setRenderer。
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