写一段时间静默拍照的代码

以下是一个简单的时间静默拍照的 Android 代码示例：

private static final int REQUEST_IMAGE_CAPTURE = 1;
private static final int INTERVAL = 5000; // 5 seconds

private Handler handler;
private Runnable runnable;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Create a handler and runnable to take pictures periodically
    handler = new Handler();
    runnable = new Runnable() {
        @Override
        public void run() {
            takePicture();
            handler.postDelayed(this, INTERVAL);
        }
    };
}

@Override
protected void onResume() {
    super.onResume();
    // Start taking pictures when the app is resumed
    handler.postDelayed(runnable, INTERVAL);
}

@Override
protected void onPause() {
    super.onPause();
    // Stop taking pictures when the app is paused
    handler.removeCallbacks(runnable);
}

private void takePicture() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        // Get the image data from the intent and save it to a file
        Bundle extras = data.getExtras();
        Bitmap imageBitmap = (Bitmap) extras.get("data");
        String fileName = "image_" + System.currentTimeMillis() + ".jpg";
        File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

该代码使用 Handler 和 Runnable 来定期调用 takePicture() 方法拍照。在 takePicture() 方法中，我们使用 Android 系统相机应用程序来拍摄照片，然后将照片数据保存到文件中。在 onActivityResult() 方法中，我们获取从相机应用程序返回的照片数据，并将其保存到文件中。

请注意，此代码需要您在应用程序的 AndroidManifest.xml 文件中声明相机权限。在 Manifest 文件中添加以下行：

<uses-permission android:name="android.permission.CAMERA" />

此外，为了确保照片数据可以保存到文件中，您还需要声明外部存储读取和写入权限。在 Manifest 文件中添加以下行：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />