我在android studio中做了一个高度图。它有一个Main活动，如下所示：
public class MainActivity extends AppCompatActivity {
private GLSurfaceView glSurfaceView;
private boolean rendererSet = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
glSurfaceView = new GLSurfaceView(this);
final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
final boolean supportsEs2 = configurationInfo.reqGlEsVersion >= 0x20000
|| (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1
&& (Build.FINGERPRINT.startsWith("generic")
|| Build.FINGERPRINT.startsWith("unknown")
|| Build.MODEL.contains("google_sdk")
|| Build.MODEL.contains("Emulator")
|| Build.MODEL.contains("Android SDK built for x86")));
final FirstOpenGLProjectRenderer firstOpenGLProjectRenderer = new FirstOpenGLProjectRenderer(this);
if(!firstOpenGLProjectRenderer.getError()) {
if (supportsEs2) {
glSurfaceView.setEGLContextClientVersion(2);
glSurfaceView.setRenderer(firstOpenGLProjectRenderer);
rendererSet = true;
} else {
Toast.makeText(this, "this device does not support OpenGL ES 2.0", Toast.LENGTH_LONG).show();
return;
}
setContentView(glSurfaceView);
}else{
setContentView(R.layout.error);
}
}
@Override
protected void onPause(){
super.onPause();
if(rendererSet) {glSurfaceView.onPause();}
}
@Override
protected void onResume(){
super.onResume();
if(rendererSet){
glSurfaceView.onResume();
}
}
public static void main(String []args){}
}
我也有渲染器类，如下所示：
public class FirstOpenGLProjectRenderer implements Renderer {
private float min;
private float max;
private float ratio;
private FloatBuffer vertexPositions;
private FloatBuffer vertexColors;
private int alpha = 1000;
private float[] positions;
private float[] colors;
private Context context;
private boolean error;
private ArrayList<Float> nodePositions;
private static final int BYTES_PER_FLOAT = 4;
private int program;
private static final String A_COLOR = "a_Color";
private int aColorLocation;
private static final String A_POSITION = "a_Position";
private int aPositionLocation;
private final int POSITION_COMPONENT_COUNT = 3; //x,y,z
private ArrayList<Float> triangleZList;
public FirstOpenGLProjectRenderer(Context context) {
this.context = context;
ArcGridReader arcGridReader = new ArcGridReader(context);
this.nodePositions = arcGridReader.getNodePositions();
this.triangleZList = arcGridReader.getTriangleZList();
error = arcGridReader.getError();
if(!error) {
calc();
}
}
public boolean calc(){
positions = new float[nodePositions.size()];
//Todo: färgerna
colors = new float[triangleZList.size() * 3];
min = Collections.min(triangleZList) / alpha;
max = Collections.max(triangleZList) / alpha;
ratio = (200 / (max - min));
int i = 0;
for (Float test : nodePositions) {
positions[i] = test / alpha;
i++;
}
double amount = (max/3)*alpha;
i = 0;
for (Float test : triangleZList) {
if(test<=0){
setColors(test,i,0);
i=i+3;
}
if(test>0 && test<=amount){
setColors(test,i,10);
i=i+3;
}
if(test>amount && test<=(2*amount)){
setColors(test,i,20);
i=i+3;
}
if(test>(2*amount) && test<=(3*amount)){
setColors(test,i,30);
i=i+3;
}
}
vertexPositions = ByteBuffer
.allocateDirect(positions.length * BYTES_PER_FLOAT)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
vertexPositions.put(positions);
vertexColors = ByteBuffer
.allocateDirect(colors.length * BYTES_PER_FLOAT)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
vertexColors.put(colors);
return true;
}
@Override
public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
GLES20.glEnable(GLES20.GL_CULL_FACE);
GLES20.glEnable(GLES20.GL_DEPTH_TEST);
String vertexShaderSource = TextResourceReader
.readTextFileFromResource(context, R.raw.vertex_shader);
String fragmentShaderSource = TextResourceReader
.readTextFileFromResource(context, R.raw.fragment_shader);
int vertexShader = ShaderHelper.compileVertexShader(vertexShaderSource);
int fragmentShader = ShaderHelper.compileFragmentShader(fragmentShaderSource);
program = ShaderHelper.linkProgram(vertexShader, fragmentShader);
if (LoggerConfig.ON) {
ShaderHelper.validateProgram(program);
}
glUseProgram(program);
aColorLocation = glGetAttribLocation(program, A_COLOR);
aPositionLocation = glGetAttribLocation(program, A_POSITION);
}
@Override
public void onSurfaceChanged(GL10 glUnused, int width, int height) {
glViewport(0, 0, width, height);
}
@Override
public void onDrawFrame(GL10 glUnused) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
glUseProgram(program);
vertexPositions.position(0);
glVertexAttribPointer(aPositionLocation, POSITION_COMPONENT_COUNT, GL_FLOAT, false, 0, vertexPositions);
glEnableVertexAttribArray(aPositionLocation);
vertexColors.position(0);
glVertexAttribPointer(aColorLocation, POSITION_COMPONENT_COUNT, GL_FLOAT, false, 0, vertexColors);
glEnableVertexAttribArray(aColorLocation);
glDrawArrays(GL_TRIANGLES, 0, positions.length);
}
public void setColors (Float test, int i,int number){
switch (number){
case 0:
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 1*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
break;
case 10:
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 1*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
break;
case 20:
colors[i] = 1*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 1*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
break;
case 30:
colors[i] = 1*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
colors[i] = 0*(((test - min) / alpha) * ratio + 20) / 255f;
i++;
break;
}
}
public boolean getError(){
return error;
}
}
所以现在我想在两个按钮的帮助下添加缩放功能。我知道缩放功能的代码，但我坚持使用按钮的实现。制作按钮并触及按钮的最佳/最简单方法是什么？我只考虑过一种方法，即在主要活动中制作一个片段，有更好的方法吗？
我已经搜索过，但没有想到什么。也许我缺少一些关键词，因为我不是Android Studio中的常用用户。干杯! :)答案 0 :(得分：0)
最简单的方法是为您的UI（按钮，文本，编辑等）使用单独的图层，并将其放在GLSurfaceView上方。在xml中定义布局：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<GLSurfaceView
android:id="@+id/gl_surface_view"
android:background="#ff0000"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/btn_zoom_in"
android:text="ZoomIn"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btn_zoom_out"
android:text="ZoomOut"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</FrameLayout>
然后让您的glSurfaceView参与活动并处理按钮点击次数：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
glSurfaceView = new GLSurfaceView(this);
findViewById(R.id.btn_zoom_in).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//handle zoom in
}
});
findViewById(R.id.btn_zoom_out).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//handle zoom out
}
});
//...
}
就是这样。
值得一提的是另一种更为复杂的方式：在OpenGL中完全绘制UI并截取GL Surface中的触摸事件：
class Surface extends GLSurfaceView{
public Surface(Context context) {
super(context);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
}
答案 1 :(得分：0)
我找到了更适合我的东西，我刚刚在mainactivity中添加了以下代码：
...
setContentView(glSurfaceView);
LinearLayout ll = new LinearLayout(this);
Button zoomIn = new Button(this);
zoomIn.setText("zoomIn");
Button zoomOut = new Button(this);
zoomOut.setText("zoomOut");
ll.addView(zoomIn);
ll.addView(zoomOut);
this.addContentView(ll,new
ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
...
其中this.addContentView是其中的一个关键部分。
答案 2 :(得分：-1)