我想在不使用隐式意图的情况下创建相机屏幕。因此，我正在使用CameraX实现这一目标。
我从Github获得了一个代码。我正在尝试解决此问题
错误：不兼容的类型：无法将文件转换为Executor imgCap.takePicture（file，new ImageCapture.OnImageCapturedListener（）
请帮助我简化此代码。
MainActivity.java
package com.example.camerax;
import android.annotation.SuppressLint;
import android.content.pm.PackageManager;
import android.graphics.Matrix;
import android.graphics.SurfaceTexture;
import android.os.Bundle;
import android.os.Environment;
import android.util.Rational;
import android.util.Size;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.AspectRatio;
import androidx.camera.core.CameraX;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageAnalysisConfig;
import androidx.camera.core.ImageCapture;
import androidx.camera.core.ImageCaptureConfig;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.PreviewConfig;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import java.io.File;
import java.util.concurrent.Executor;
//saus: https://codelabs.developers.google.com/codelabs/camerax-getting-started/
public class MainActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener{
private int REQUEST_CODE_PERMISSIONS = 10; //arbitrary number, can be changed accordingly
private final String[] REQUIRED_PERMISSIONS = new String[]{"android.permission.CAMERA","android.permission.WRITE_EXTERNAL_STORAGE"};
TextureView txView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txView = findViewById(R.id.view_finder);
if(allPermissionsGranted()){
startCamera(); //start camera if permission has been granted by user
} else{
ActivityCompat.requestPermissions(this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS);
}
}
private void startCamera() {
//make sure there isn't another camera instance running before starting
CameraX.unbindAll();
/* start preview */
int aspRatioW = txView.getWidth(); //get width of screen
int aspRatioH = txView.getHeight(); //get height
Rational rational = new Rational(aspRatioW,aspRatioH); //aspect ratio
Size screen = new Size(aspRatioW, aspRatioH); //size of the screen
//config obj for preview/viewfinder thingy.
@SuppressLint("RestrictedApi") PreviewConfig pConfig = new PreviewConfig.Builder().setTargetAspectRatioCustom(rational).setTargetResolution(screen).build();
Preview preview = new Preview(pConfig); //lets build it
preview.setOnPreviewOutputUpdateListener(
new Preview.OnPreviewOutputUpdateListener() {
//to update the surface texture we have to destroy it first, then re-add it
@Override
public void onUpdated(Preview.PreviewOutput output){
ViewGroup parent = (ViewGroup) txView.getParent();
parent.removeView(txView);
parent.addView(txView, 0);
txView.setSurfaceTexture(output.getSurfaceTexture());
updateTransform();
}
});
/* image capture */
//config obj, selected capture mode
ImageCaptureConfig imgCapConfig = new ImageCaptureConfig.Builder().setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
.setTargetRotation(getWindowManager().getDefaultDisplay().getRotation()).build();
final ImageCapture imgCap = new ImageCapture(imgCapConfig);
findViewById(R.id.capture_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".jpg");
imgCap.takePicture(file,new ImageCapture.OnImageCapturedListener() {
@Override
public void onCaptureSuccess(ImageProxy image, int rotationDegrees) {
super.onCaptureSuccess(image, rotationDegrees);
String msg = "Photo capture succeeded: " + file.getAbsolutePath();
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
}
@Override
public void onError(@NonNull ImageCapture.ImageCaptureError imageCaptureError, @NonNull String message, @Nullable Throwable cause) {
super.onError(imageCaptureError, message, cause);
String msg = "Photo capture failed: " + message;
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
if(cause != null){
cause.printStackTrace();
}
}
});
}
});
/* image analyser */
ImageAnalysisConfig imgAConfig = new ImageAnalysisConfig.Builder().setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE).build();
ImageAnalysis analysis = new ImageAnalysis(imgAConfig);
//bind to lifecycle:
CameraX.bindToLifecycle((LifecycleOwner)this, analysis, imgCap, preview);
}
private void updateTransform(){
/*
* compensates the changes in orientation for the viewfinder, bc the rest of the layout stays in portrait mode.
* methinks :thonk:
* imgCap does this already, this class can be commented out or be used to optimise the preview
*/
Matrix mx = new Matrix();
float w = txView.getMeasuredWidth();
float h = txView.getMeasuredHeight();
float centreX = w / 2f; //calc centre of the viewfinder
float centreY = h / 2f;
int rotationDgr;
int rotation = (int)txView.getRotation(); //cast to int bc switches don't like floats
switch(rotation){ //correct output to account for display rotation
case Surface.ROTATION_0:
rotationDgr = 0;
break;
case Surface.ROTATION_90:
rotationDgr = 90;
break;
case Surface.ROTATION_180:
rotationDgr = 180;
break;
case Surface.ROTATION_270:
rotationDgr = 270;
break;
default:
return;
}
mx.postRotate((float)rotationDgr, centreX, centreY);
txView.setTransform(mx); //apply transformations to textureview
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//start camera when permissions have been granted otherwise exit app
if(requestCode == REQUEST_CODE_PERMISSIONS){
if(allPermissionsGranted()){
startCamera();
} else{
Toast.makeText(this, "Permissions not granted by the user.", Toast.LENGTH_SHORT).show();
finish();
}
}
}
private boolean allPermissionsGranted(){
//check if req permissions have been granted
for(String permission : REQUIRED_PERMISSIONS){
if(ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED){
return false;
}
}
return true;
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
//array w/ permissions from manifest
}
* build.gradle **
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.camerax"
minSdkVersion 22
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0-beta01'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
def camerax_version = '1.0.0-alpha06'
//noinspection GradleDependency
implementation "androidx.camera:camera-core:${camerax_version}"
//noinspection GradleDependency
implementation "androidx.camera:camera-camera2:${camerax_version}"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
尝试一下在Activity]中定义执行器
private val executor = Executors.newSingleThreadExecutor()在
takePicture方法内传递执行程序。
findViewById(R.id.capture_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".jpg");
imgCap.takePicture(file, executor, new ImageCapture.OnImageCapturedListener() {
@Override
public void onCaptureSuccess(ImageProxy image, int rotationDegrees) {
super.onCaptureSuccess(image, rotationDegrees);
String msg = "Photo capture succeeded: " + file.getAbsolutePath();
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
}
@Override
public void onError(@NonNull ImageCapture.ImageCaptureError imageCaptureError, @NonNull String message, @Nullable Throwable cause) {
super.onError(imageCaptureError, message, cause);
String msg = "Photo capture failed: " + message;
Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
if(cause != null){
cause.printStackTrace();
}
}
});
}
});