android Java点击按钮后调用CameraX系统相机
时间: 2023-10-13 13:04:12 浏览: 55
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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