在AndroidManifest.xml文件中，添加相机权限声明：

同时，在代码中添加检查相机是否可用的逻辑： // Check if device has camera private boolean checkCameraHardware(Context context) { if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){ // this device has a camera return true; } else { // no camera on this device return false; } }

// Check if camera is available private boolean isCameraAvailable() { Camera camera = null; try { camera = Camera.open(); } catch (Exception e) { e.printStackTrace(); } return (camera != null); }

// Use the camera private void useCamera() { // Check if the device has a camera if (!checkCameraHardware(this)) { Toast.makeText(this, "This device does not have a camera.", Toast.LENGTH_SHORT).show(); return; }

// Check if the camera is available
if (!isCameraAvailable()) {
    Toast.makeText(this, "The camera is not available.", Toast.LENGTH_SHORT).show();
    return;
}

// Open the camera
Camera camera = null;
try {
    camera = Camera.open();
} catch (Exception e) {
    e.printStackTrace();
}

if (camera != null) {
    // Use the camera
    // ...

    // Release the camera
    camera.release();
}

}