我试图使用GLSurface来显示自定义视图.

我的xml

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="net.letsense.matrixtest.MainActivity">

android:layout_width="300dp"

android:layout_height="300dp"

android:id="@+id/my_surface_view"

/>

我的主要

package net.letsense.matrixtest;

import android.app.Activity;

import android.opengl.GLSurfaceView;

import android.os.Bundle;

/**

* Created by borislegovic on 03/11/2017.

*/

public class Main extends Activity {

private int mPositionHandle;

private int mColorHandle;

private GLSurfaceView mGLView;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// Create a GLSurfaceView instance and set it

// as the ContentView for this Activity.

// mGLView = new MyGLSurfaceView(this);

// mGLView = findViewById(R.id.my_surface_view);

//mGLView.setEGLContextClientVersion(2);

// mGLView = new MyGLSurfaceView(this);

// setContentView(mGLView);

}

@Override

protected void onPause() {

// The following call pauses the rendering thread.

// If your OpenGL application is memory intensive,

// you should consider de-allocating objects that

// consume significant memory here.

super.onPause();

// mGLView.onPause();

}

@Override

protected void onResume() {

// The following call resumes a paused rendering thread.

// If you de-allocated graphic objects for onPause()

// this is a good place to re-allocate them.

super.onResume();

// mGLView.onResume();

}

}

奇怪的是我没有对surfaceView对象做任何事情,它仍然给我这个崩溃：

java.lang.NullPointerException：尝试在空对象引用上调用虚方法’void android.opengl.GLSurfaceView $GLThread.surfaceCreated()’

在android.opengl.GLSurfaceView.surfaceCreated(GLSurfaceView.java:524)

解决方法:

您的GLSurfaceView未初始化,您需要初始化它.

首先创建类MyGLRenderer：

class MyGLRenderer implements GLSurfaceView.Renderer {

public void onSurfaceCreated(GL10 gl, EGLConfig config)

{

gl.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);

}

public void onSurfaceChanged(GL10 gl, int w, int h) {

gl.glViewport(0, 0, w, h);

}

public void onDrawFrame(GL10 gl) {

gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

}

}

然后将其添加到OnCreate方法：

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mGLView = (GLSurfaceView) this.findViewById(R.id.my_surface_view);

mGLView.setRenderer(new MyGLRenderer());

}

您可以阅读有关OpenGL ES here的更多信息.

标签：android,opengl-es

来源： https://codeday.me/bug/20190727/1550854.html