android调用摄像头
时间: 2023-10-18 19:19:19 浏览: 45
Android可以调用摄像头进行拍照或录像,具体步骤如下:
1. 获取Camera实例:
```java
Camera camera = Camera.open();
```
2. 配置摄像头参数:
```java
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(width, height); // 设置预览尺寸
parameters.setPictureSize(width, height); // 设置拍照尺寸
camera.setParameters(parameters);
```
3. 预览摄像头:
```java
SurfaceView surfaceView = findViewById(R.id.surface_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// do nothing
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
}
});
```
4. 拍照或录像:
```java
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// 处理拍照数据
}
});
camera.unlock();
MediaRecorder recorder = new MediaRecorder();
recorder.setCamera(camera);
recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
recorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
recorder.setOutputFile(outputFile);
recorder.setPreviewDisplay(surfaceHolder.getSurface());
recorder.prepare();
recorder.start();
```
注意:使用完摄像头或录像机后必须释放资源,否则可能导致其他应用无法使用摄像头或录像机。
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