SurfaceTexture texture = mTextureView.getSurfaceTexture(); Cannot resolve symbol 'mTextureView'
时间: 2024-01-24 22:17:42 浏览: 35
这个错误提示表明你的代码中使用了一个叫做 `mTextureView` 的变量,但是编译器无法找到它的定义。这通常是因为你没有在代码中声明或者初始化这个变量。
你需要检查一下你的代码,看看是否有定义过 `mTextureView` 这个变量。如果没有,你需要先声明并且初始化它,例如:
```
TextureView mTextureView = findViewById(R.id.texture_view);
```
如果你已经声明了 `mTextureView` 变量,那么可能是因为它的作用域不对,导致其他部分无法访问。你需要确保在需要使用 `mTextureView` 的地方,它的作用域是正确的。
相关问题
private void createPreviewSession() { try { SurfaceTexture texture = mTextureView.getSurfaceTexture(); texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight()); Surface surface = new Surface(texture); mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); mPreviewRequestBuilder.addTarget(surface); mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() { @Override public void onConfigured(CameraCaptureSession session) { mCaptureSession = session; try { mPreviewRequest = mPreviewRequestBuilder.build(); mCaptureSession.setRepeatingRequest(mPreviewRequest, null, null); }catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void onConfigureFailed(CameraCaptureSession session) { Toast.makeText(Diary.this, "Failed", Toast.LENGTH_SHORT).show(); } }, null); }catch (CameraAccessException e) { e.printStackTrace(); } } //开始预览 private void startPreview() { try { createPreviewSession(); }catch (CameraAccessException e) { e.printStackTrace(); } }
这段代码是用于 Android 相机预览的,主要分为两个部分:
1. createPreviewSession():该方法用于创建相机预览会话,其中包括设置预览的 Surface 和捕获请求等操作。在该方法中,首先获取 TextureView 的 SurfaceTexture 并设置其大小,然后将其转换为 Surface 对象,接着创建相机捕获请求模板为 TEMPLATE_PREVIEW 的 CaptureRequest,并将其添加到会话的目标列表中。最后通过 CameraCaptureSession.setRepeatingRequest() 方法启动预览。
2. startPreview():该方法用于开始相机预览,通过调用 createPreviewSession() 方法来创建预览会话。
需要注意的是,在 Android 相机开发中,相机预览是一个很重要的功能,需要仔细处理好各种异常情况。
private async parseMaterial(osgStateSet: any) { let material = new THREE.MeshBasicMaterial({ // side: THREE.DoubleSide, }); //THREE.FrontSide 背面 // THREE.BackSide 前面 // THREE.DoubleSide 双面 let osgImage = osgStateSet.TextureAttributeList[0].value.StateAttribute.Image; // let texture = this.parseImage(osgImage); let fileName = osgImage.Name; const isJPEG = fileName.search(/.jpe?g($|?)/i) > 0; const isPNG = fileName.search(/.png($|?)/i) > 0; if (!isPNG && !isJPEG) { return; } let mimeType = isPNG ? 'image/png' : 'image/jpeg'; let imageUri: any = new Blob([osgImage.Data], { type: mimeType }); let base64 = await this.blobToBase64(imageUri); // debugger let imageUrl: any = URL.createObjectURL(imageUri); try { let texture = new THREE.TextureLoader().load(base64, () => { texture.needsUpdate = true; // texture.format = THREE.RGBAFormat; texture.type = THREE.UnsignedShort5551Type; texture.minFilter = THREE.LinearMipmapNearestFilter; texture.magFilter = THREE.LinearMipmapNearestFilter; texture.generateMipmaps = false; // texture.format = THREE.RGBAIntegerFormat; // texture.minFilter = THREE.NearestFilter; // texture.magFilter = THREE.NearestFilter; // texture.minFilter = THREE.LinearMipMapLinearFilter; // texture.magFilter = THREE.LinearFilter; // texture.wrapS = THREE.RepeatWrapping; // texture.wrapT = THREE.RepeatWrapping; // texture.anisotropy = 1; // texture.generateMipmaps = false; // texture.encoding = THREE.sRGBEncoding; }); imageUri = null; osgImage = null; imageUrl = null; if (texture) { material.map = texture; } } catch (e) { console.log('纹理加载出错', e); } osgStateSet = null; return material; } private blobToBase64(blob: any) { return new Promise((resolve, reject) => { const fileReader = new FileReader(); // readAsDataURL fileReader.readAsDataURL(blob); fileReader.onload = (e: any) => { resolve(e.target.result); }; }); }没有显示base64图片的纹理,也没有报错,请找出问题,并给出详细代码
在代码中,你使用了一个Blob对象来加载纹理图片,并将其转换成了base64编码,但是在加载纹理时,却直接使用了base64编码字符串来加载纹理,这个可能是导致问题的原因。正确的做法应该是使用图片的URL来加载纹理,而不是直接使用base64编码字符串。
具体修改代码如下:
```typescript
private async parseMaterial(osgStateSet: any) {
let material = new THREE.MeshBasicMaterial({
// side: THREE.DoubleSide,
});
//THREE.FrontSide 背面
// THREE.BackSide 前面
// THREE.DoubleSide 双面
let osgImage = osgStateSet.TextureAttributeList[0].value.StateAttribute.Image;
// let texture = this.parseImage(osgImage);
let fileName = osgImage.Name;
const isJPEG = fileName.search(/.jpe?g($|?)/i) > 0;
const isPNG = fileName.search(/.png($|?)/i) > 0;
if (!isPNG && !isJPEG) {
return;
}
let mimeType = isPNG ? 'image/png' : 'image/jpeg';
let imageUri: any = new Blob([osgImage.Data], { type: mimeType });
try {
// 使用图片的URL来加载纹理
let texture = await new Promise<THREE.Texture>((resolve) => {
let imageUrl = URL.createObjectURL(imageUri);
new THREE.TextureLoader().load(imageUrl, (texture) => {
// 在加载完成的回调函数中,手动释放URL对象,避免内存泄漏问题
URL.revokeObjectURL(imageUrl);
texture.needsUpdate = true;
// texture.format = THREE.RGBAFormat;
texture.type = THREE.UnsignedShort5551Type;
texture.minFilter = THREE.LinearMipmapNearestFilter;
texture.magFilter = THREE.LinearMipmapNearestFilter;
texture.generateMipmaps = false;
// texture.format = THREE.RGBAIntegerFormat;
// texture.minFilter = THREE.NearestFilter;
// texture.magFilter = THREE.NearestFilter;
// texture.minFilter = THREE.LinearMipMapLinearFilter;
// texture.magFilter = THREE.LinearFilter;
// texture.wrapS = THREE.RepeatWrapping;
// texture.wrapT = THREE.RepeatWrapping;
// texture.anisotropy = 1;
// texture.generateMipmaps = false;
// texture.encoding = THREE.sRGBEncoding;
resolve(texture);
});
});
if (texture) {
material.map = texture;
}
} catch (e) {
console.log('纹理加载出错', e);
}
osgStateSet = null;
return material;
}
private blobToBase64(blob: any) {
return new Promise((resolve, reject) => {
const fileReader = new FileReader();
// readAsDataURL
fileReader.readAsDataURL(blob);
fileReader.onload = (e: any) => {
resolve(e.target.result);
};
});
}
```
其中,使用了一个Promise对象来等待纹理加载完成后返回,同时在加载完成的回调函数中,手动释放URL对象,避免内存泄漏问题。另外,建议在加载纹理时,设置合适的minFilter和magFilter,以获得更好的渲染效果。
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