需要有关创建捕获图片的方法的帮助，以及在按下按钮时保存图片的方法。
目前，只要应用程序启动，相机就会在TextureView中显示，我正在努力寻找捕捉和保存图片的方法。
如果从屏幕或实际的手机摄像头捕获它并不重要。
Github：https://github.com/Chalikov/group26/tree/experimental
谢谢。
public class MainActivity extends AppCompatActivity {
public static final int REQUEST_CAMERA_PERMISSION = 200;
public static final int CAMERA_REQUEST = 1888;
private static final String TAG = "AndroidCameraApi";
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
protected CameraDevice cameraDevice;
protected CameraCaptureSession cameraCaptureSessions;
protected CaptureRequest.Builder captureRequestBuilder;
private Button takePictureButton;
private Button retryButton;
private Button acceptButton;
private TextureView textureView;
private String cameraId;
private Size imageDimension;
TextureView.SurfaceTextureListener textureListener = new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
//open your camera here
openCamera();
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
// Transform you image captured size according to the surface width and height
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
};
private ImageReader imageReader;
private Uri file;
private boolean mFlashSupported;
private Handler mBackgroundHandler;
private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
//This is called when the camera is open
Log.e(TAG, "onOpened");
cameraDevice = camera;
createCameraPreview();
}
@Override
public void onDisconnected(CameraDevice camera) {
cameraDevice.close();
}
@Override
public void onError(CameraDevice camera, int error) {
cameraDevice.close();
cameraDevice = null;
}
};
private HandlerThread mBackgroundThread;
private View view;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
textureView = (TextureView) findViewById(R.id.texture);
assert textureView != null;
textureView.setSurfaceTextureListener(textureListener);
takePictureButton = (Button) findViewById(R.id.btn_takepicture);
assert takePictureButton != null;
takePictureButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
takePicture();
takePictureButton.setVisibility(View.INVISIBLE);
retryButton = (Button) findViewById(R.id.btn_retry);
acceptButton = (Button) findViewById(R.id.btn_analyze);
retryButton.setVisibility(View.VISIBLE);
acceptButton.setVisibility(View.INVISIBLE);
retryButton.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View v)
{
createCameraPreview();
retryButton.setVisibility(View.INVISIBLE);
acceptButton.setVisibility(View.INVISIBLE);
takePictureButton.setVisibility(View.VISIBLE);
}
});
retryButton.setVisibility(View.VISIBLE); //SHOW the button
acceptButton.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View v)
{
createCameraPreview();
retryButton.setVisibility(View.INVISIBLE);
acceptButton.setVisibility(View.INVISIBLE);
takePictureButton.setVisibility(View.VISIBLE);
}
});
acceptButton.setVisibility(View.VISIBLE); //SHOW the button
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
imageView.setImageURI(file);
}
}
}
protected void startBackgroundThread() {
mBackgroundThread = new HandlerThread("Camera Background");
mBackgroundThread.start();
mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
}
protected void stopBackgroundThread() {
mBackgroundThread.quitSafely();
try {
mBackgroundThread.join();
mBackgroundThread = null;
mBackgroundHandler = null;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
protected void takePicture() {
}
protected void savePicture() {
}
// private static File getOutputMediaFile(){
// File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
// Environment.DIRECTORY_PICTURES), "CameraDemo");
//
// if (!mediaStorageDir.exists()){
// if (!mediaStorageDir.mkdirs()){
// return null;
// }
// }
//
// String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
// return new File(mediaStorageDir.getPath() + File.separator +
// "IMG_"+ timeStamp + ".jpg");
// }
protected void createCameraPreview() {
try {
SurfaceTexture texture = textureView.getSurfaceTexture();
assert texture != null;
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
texture.setDefaultBufferSize(height, width);
Surface surface = new Surface(texture);
captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureRequestBuilder.addTarget(surface);
cameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback(){
@Override
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
//The camera is already closed
if (null == cameraDevice) {
return;
}
// When the session is ready, we start displaying the preview.
cameraCaptureSessions = cameraCaptureSession;
updatePreview();
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
Toast.makeText(MainActivity.this, "Configuration change", Toast.LENGTH_SHORT).show();
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void openCamera() {
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
Log.e(TAG, "is camera open");
try {
cameraId = manager.getCameraIdList()[0];
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
assert map != null;
imageDimension = map.getOutputSizes(SurfaceTexture.class)[0];
// Add permission for camera and let user grant the permission
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);
return;
}
manager.openCamera(cameraId, stateCallback, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
Log.e(TAG, "openCamera X");
}
protected void updatePreview() {
if(null == cameraDevice) {
Log.e(TAG, "updatePreview error, return");
}
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
try {
cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void closeCamera() {
if (null != cameraDevice) {
cameraDevice.close();
cameraDevice = null;
}
if (null != imageReader) {
imageReader.close();
imageReader = null;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == REQUEST_CAMERA_PERMISSION) {
if (grantResults[0] == PackageManager.PERMISSION_DENIED) {
// close the app
Toast.makeText(MainActivity.this, "Sorry!!!, you can't use this app without granting permission", Toast.LENGTH_LONG).show();
finish();
}
}
}
@Override
protected void onResume() {
takePictureButton.setVisibility(View.VISIBLE);
super.onResume();
Log.e(TAG, "onResume");
startBackgroundThread();
if (textureView.isAvailable()) {
openCamera();
} else {
textureView.setSurfaceTextureListener(textureListener);
}
}
@Override
protected void onPause() {
retryButton.setVisibility(View.INVISIBLE);
acceptButton.setVisibility(View.INVISIBLE);
Log.e(TAG, "onPause");
stopBackgroundThread();
super.onPause();
closeCamera();
}
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.android.project26.MainActivity">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<TextureView
android:id="@+id/texture"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<Button
android:id="@+id/btn_takepicture"
android:layout_width="79dp"
android:layout_height="79dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="80dp"
android:background="@drawable/camera_button"
android:visibility="visible"/>
<Button
android:id="@+id/btn_retry"
android:layout_width="79dp"
android:layout_height="79dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="left|bottom"
android:layout_marginBottom="80dp"
android:layout_marginLeft="60dp"
android:background="@drawable/retry"
android:visibility="invisible" />
<Button
android:id="@+id/btn_analyze"
android:layout_width="79dp"
android:layout_height="79dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="right|bottom"
android:layout_marginBottom="80dp"
android:layout_marginRight="60dp"
android:background="@drawable/analyze"
android:visibility="invisible" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|bottom"
android:background="#4D000000"
android:orientation="horizontal">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#00ffffff"
android:text="Gallery"
android:textColor="#fff"
android:textSize="12sp"/>
<Button
android:id="@+id/camera_menu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#00ffffff"
android:text="Camera"
android:textColor="#fff"
android:textSize="12sp"/>
</LinearLayout>
</FrameLayout>
</LinearLayout>