android拍照界面怎么写

编写Android拍照界面需要以下几个步骤：

1. 创建一个布局文件(activity_camera.xml)，包含一个SurfaceView和一个拍照按钮：

```

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@+id/surface_view"

android:layout_width="match_parent"

android:layout_height="match_parent" />

android:id="@+id/btn_capture"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"

android:layout_marginBottom="16dp"

android:text="拍照" />

```

2. 创建一个CameraActivity类，实现拍照逻辑：

```java

public class CameraActivity extends AppCompatActivity implements SurfaceHolder.Callback, Camera.PictureCallback {

private Camera mCamera;

private SurfaceView mSurfaceView;

private Button mCaptureButton;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_camera);

mSurfaceView = findViewById(R.id.surface_view);

mSurfaceView.getHolder().addCallback(this);

mCaptureButton = findViewById(R.id.btn_capture);

mCaptureButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

if (mCamera != null) {

mCamera.takePicture(null, null, CameraActivity.this);

}

}

});

}

@Override

protected void onResume() {

super.onResume();

if (mCamera == null) {

mCamera = Camera.open();

}

}

@Override

protected void onPause() {

super.onPause();

releaseCamera();

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

try {

mCamera.setPreviewDisplay(holder);

mCamera.startPreview();

} catch (IOException e) {

e.printStackTrace();

}

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

// 实现自动对焦

mCamera.autoFocus(null);

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

releaseCamera();

}

@Override

public void onPictureTaken(byte[] data, Camera camera) {

// 处理拍照结果

// 将data转化为Bitmap或保存为文件等

// ...

// 继续预览

mCamera.startPreview();

}

private void releaseCamera() {

if (mCamera != null) {

mCamera.stopPreview();

mCamera.release();

mCamera = null;

}

}

}

```

3. 在AndroidManifest.xml中添加Camera权限：

```xml

```

4. 在AndroidManifest.xml中将CameraActivity设置为启动页：

```xml

android:name=".CameraActivity"

android:label="Camera" >

```

5. 运行程序，即可在拍照界面进行拍照操作。