如何拍摄raw图,并且提供raw图预览流接口给其他app
时间: 2024-03-17 22:46:48 浏览: 28
要拍摄RAW图像并提供RAW图像预览流接口给其他应用程序,您需要使用Camera2 API。以下是如何实现此功能的一些关键步骤:
1. 首先,在AndroidManifest.xml文件中添加以下权限:
```xml
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
```
2. 在布局文件中添加TextureView用于实时预览相机:
```xml
<TextureView
android:id="@+id/textureView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
```
3. 在Activity中初始化相机和TextureView:
```java
public class CameraActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener {
private CameraDevice cameraDevice;
private CameraCaptureSession captureSession;
private CaptureRequest.Builder previewRequestBuilder;
private TextureView textureView;
private Size previewSize;
private ImageReader rawImageReader;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
// 初始化TextureView
textureView = findViewById(R.id.textureView);
textureView.setSurfaceTextureListener(this);
}
}
```
4. 在SurfaceTextureListener回调方法中打开相机,创建预览会话和ImageReader:
```java
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
// 打开相机
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
previewSize = map.getOutputSizes(SurfaceTexture.class)[0];
cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice cameraDevice) {
CameraActivity.this.cameraDevice = cameraDevice;
// 创建预览会话
createPreviewSession();
// 创建ImageReader
rawImageReader = ImageReader.newInstance(previewSize.getWidth(), previewSize.getHeight(),
ImageFormat.RAW_SENSOR, 1);
rawImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader imageReader) {
// 获取RAW图像
Image image = imageReader.acquireLatestImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
// 将RAW图像转换为Bitmap并显示
Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(bitmap);
// 将RAW图像通过广播发送给其他应用程序
Intent intent = new Intent();
intent.setAction("com.example.cameraapp.RAW_IMAGE");
intent.putExtra("raw_image", bytes);
sendBroadcast(intent);
// 释放Image
image.close();
}
}, null);
}
@Override
public void onDisconnected(CameraDevice cameraDevice) {
cameraDevice.close();
CameraActivity.this.cameraDevice = null;
}
@Override
public void onError(CameraDevice cameraDevice, int i) {
cameraDevice.close();
CameraActivity.this.cameraDevice = null;
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void createPreviewSession() {
try {
SurfaceTexture texture = textureView.getSurfaceTexture();
texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
Surface surface = new Surface(texture);
previewRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
previewRequestBuilder.addTarget(surface);
cameraDevice.createCaptureSession(Arrays.asList(surface, rawImageReader.getSurface()),
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession cameraCaptureSession) {
if (cameraDevice == null) {
return;
}
captureSession = cameraCaptureSession;
try {
previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
captureSession.setRepeatingRequest(previewRequestBuilder.build(), null, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
Toast.makeText(CameraActivity.this, "Failed to create capture session", Toast.LENGTH_SHORT).show();
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
```
5. 在Activity中注册广播接收器以接收其他应用程序发送的RAW图像:
```java
public class CameraActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener {
...
private BroadcastReceiver rawImageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
byte[] bytes = intent.getByteArrayExtra("raw_image");
// 将RAW图像转换为Bitmap并显示
Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(bitmap);
}
};
@Override
protected void onResume() {
super.onResume();
IntentFilter filter = new IntentFilter();
filter.addAction("com.example.cameraapp.RAW_IMAGE");
registerReceiver(rawImageReceiver, filter);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(rawImageReceiver);
}
}
```
6. 在AndroidManifest.xml文件中声明广播接收器:
```xml
<receiver android:name=".CameraActivity$RawImageReceiver" />
```
7. 在其他应用程序中,您可以使用Intent过滤器来接收Camera app发送的RAW图像。例如:
```java
BroadcastReceiver rawImageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
byte[] bytes = intent.getByteArrayExtra("raw_image");
// 处理RAW图像
}
};
IntentFilter filter = new IntentFilter();
filter.addAction("com.example.cameraapp.RAW_IMAGE");
registerReceiver(rawImageReceiver, filter);
```
以上就是如何拍摄RAW图像并提供RAW图像预览流接口给其他应用程序的一些关键步骤。