public void run(){ try { ProcessCameraProvider cameraProvider = cameraProviderFuture.get(); Preview preview = new Preview.Builder().build(); preview.setSurfaceProvider(previewView.getSurfaceProvider()); imageCapture = new ImageCapture.Builder().build(); CameraSelector cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA; cameraProvider.unbindAll(); cameraProvider.bindToLifecycle((LifecycleOwner) MainActivity.this, cameraSelector, preview, imageCapture); }catch (ExecutionException | InterruptedException e){ e.printStackTrace(); } }
时间: 2023-12-06 13:40:33 浏览: 130
这段代码是在Android平台上使用CameraX库来获取相机预览和拍照功能的代码。在run()方法中,首先使用cameraProviderFuture.get()获取相机提供者。然后使用Preview.Builder()构建一个预览对象,将预览对象的SurfaceProvider设置为预览视图(previewView)的SurfaceProvider。
接着使用ImageCapture.Builder()构建一个ImageCapture对象,然后使用CameraSelector.DEFAULT_BACK_CAMERA选择后置摄像头。最后,使用相机提供者的bindToLifecycle()方法将预览、拍照和摄像头绑定到MainActivity的生命周期上。
需要注意的是,在这段代码中可能会抛出ExecutionException和InterruptedException异常,需要进行异常处理。
相关问题
package com.example.photodiary; import android.os.Bundle; import android.view.View; import android.widget.Button; import androidx.appcompat.app.AppCompatActivity; import androidx.camera.core.CameraSelector; import androidx.camera.core.ImageCapture; import androidx.camera.core.Preview; import androidx.camera.lifecycle.ProcessCameraProvider; import androidx.camera.view.PreviewView; import androidx.core.content.ContextCompat; import androidx.lifecycle.LifecycleOwner; import com.google.common.util.concurrent.ListenableFuture; import java.util.concurrent.ExecutionException; public class Diary extends AppCompatActivity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_diary); //点击按钮调用系统相机 Button button = findViewById(R.id.button_2); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { startCamera(); } }); } private PreviewView previewView; private ImageCapture imageCapture; private void startCamera(){ previewView = findViewById(R.id.preview_view); ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this); cameraProviderFuture.addListener(new Runnable() { public void run(){ try { ProcessCameraProvider cameraProvider = cameraProviderFuture.get(); Preview preview = new Preview.Builder().build(); preview.setSurfaceProvider(previewView.createSurfaceProvider()); imageCapture = new ImageCapture.Builder().build(); CameraSelector cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA; cameraProvider.unbindAll(); cameraProvider.bindToLifecycle((LifecycleOwner) MainActivity.this, cameraSelector, preview, imageCapture); }catch (ExecutionException | InterruptedException e){ e.printStackTrace(); } } }, ContextCompat.getMainExecutor(this)); } }
这是一个使用 AndroidX Camera 组件开发的相机应用,可以通过点击按钮启动系统相机。在 onCreate() 方法中设置了按钮的点击事件,当用户点击按钮时,会调用 startCamera() 方法来启动相机。startCamera() 方法中使用了 CameraX 的 API 来获取相机提供者和相机选择器,并绑定到生命周期所有者上。同时,还创建了一个预览和一个图像捕捉器,用于预览相机画面和捕捉照片。最后,使用 SurfaceView 技术将预览视图与相机绑定,从而实现相机预览功能。
android Java点击按钮后调用CameraX系统相机
使用CameraX可以很方便地实现系统相机的调用,以下是一个简单的实现步骤:
1. 首先,将CameraX依赖项添加到项目的build.gradle文件中:
```
dependencies {
def camerax_version = "1.0.0-alpha07"
implementation "androidx.camera:camera-core:$camerax_version"
implementation "androidx.camera:camera-camera2:$camerax_version"
}
```
2. 接着,在布局文件中添加一个按钮:
```
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Take photo" />
```
3. 然后,在Activity或Fragment中获取按钮并设置点击事件:
```
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startCamera();
}
});
}
private void startCamera() {
// TODO: Implement camera logic
}
```
4. 在startCamera()方法中,创建一个ProcessCameraProvider对象,并使用它来获取CameraX的Camera对象,然后将它绑定到一个预览视图上:
```
private PreviewView previewView;
private ImageCapture imageCapture;
private void startCamera() {
previewView = findViewById(R.id.preview_view);
ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
cameraProviderFuture.addListener(new Runnable() {
@Override
public void run() {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
Preview preview = new Preview.Builder().build();
preview.setSurfaceProvider(previewView.createSurfaceProvider());
imageCapture = new ImageCapture.Builder().build();
CameraSelector cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA;
cameraProvider.unbindAll();
cameraProvider.bindToLifecycle((LifecycleOwner) MainActivity.this, cameraSelector, preview, imageCapture);
} catch (ExecutionException | InterruptedException e) {
e.printStackTrace();
}
}
}, ContextCompat.getMainExecutor(this));
}
```
5. 最后,在按钮的点击事件中调用startCamera()方法即可启动系统相机并显示预览视图:
```
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startCamera();
}
});
```
注意,为了让CameraX能够正常工作,你需要在AndroidManifest.xml文件中添加以下权限:
```
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.any" />
```
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