一起用代码吸猫！本文正在参与【喵星人征文活动】

思路

看到活动之后我就上网搜了一下逗猫app，搜到了snapCat这个app的介绍，就参考这个app的思路——用动图吸引猫的注意力，当猫爪子按在图上的时候偷拍一张。试试能不能给格格拍点好看的照片。

step1.偷偷拍照

用android.hardware.Camera搭配SurfaceView。

在布局文件添加预览界面（虽然猫不需要看预览，但还是要startpreview）

Important: Call startPreview() to start updating the preview surface. Preview must be started before you can take a picture.

<SurfaceView
    android:id="@+id/sf"
    android:layout_width="1dp"
    android:layout_height="1dp" />

初始化前置摄像头

Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx++) {
    Camera.getCameraInfo(camIdx, cameraInfo);
    if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        try {
            myCamera = Camera.open(camIdx);
        } catch (RuntimeException e) {
            e.printStackTrace();
        }
    }
}

try {
    myCamera.setPreviewDisplay(surfaceView.getHolder());
} catch (IOException e) {
    e.printStackTrace();
    myCamera.stopPreview();
    myCamera.release();
    myCamera = null;
}

myCamera.startPreview();

拍照保存到相册

private void takePhoto() {
    myCamera.autoFocus(myAutoFocus);
    myCamera.takePicture(null, null, myPicCallback);
}

private Camera.AutoFocusCallback myAutoFocus = new Camera.AutoFocusCallback() {
    @Override
    public void onAutoFocus(boolean success, Camera camera) {
    }
};

private Camera.PictureCallback myPicCallback = new Camera.PictureCallback() {
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        // 将得到的照片进行270°旋转，使其竖直
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
        Matrix matrix = new Matrix();
        matrix.preRotate(270);
        bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
                bitmap.getHeight(), matrix, true);
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
                .format(new Date());
        saveImage(timeStamp+".jpg", bitmap);
    }
};

@RequiresApi(api = Build.VERSION_CODES.Q)
private void saveImage(String fileName, Bitmap bitmap) {
    try {
        ContentValues contentValues = new ContentValues();
        contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, fileName);
        contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, "DCIM/cat/");
        contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/JPEG");
        Uri uri = mContext.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
        if (uri != null) {
            OutputStream outputStream = mContext.getContentResolver().openOutputStream(uri);
            if (outputStream != null) {
                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream);
                outputStream.flush();
                outputStream.close();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

关闭摄像头

myCamera.stopPreview();
myCamera.release();
myCamera = null;

step2.吸引注意

在布局文件添加gif图片

<ImageView
    android:id="@+id/image"
    android:layout_width="150dp"
    android:layout_height="150dp"
    android:layout_centerInParent="true" />

Glide.with(this).asGif().load(R.mipmap.bird).into(image);

点击图片-随机移动-拍照

image.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        x = (float) (Math.random() * width);
        y = (float) (Math.random() * height);
        Path path = new Path();
        path.moveTo(x,y);
        ObjectAnimator animator = ObjectAnimator.ofFloat(v, View.X, View.Y, path);
        animator.setDuration(2000);
        animator.start();
        
        takePhoto();
    }
});

width和height限制随机移动的范围

int defaultMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,150,getResources().getDisplayMetrics());

width = getWindowManager().getDefaultDisplay().getWidth()-defaultMargin;
height = getWindowManager().getDefaultDisplay().getHeight()-defaultMargin;

效果

大失败……完全吸引不了格格的注意，目中无手机，用小图移动的效果不好，之后做大图的动画试试，并且猫爪不太容易触发点击事件……放个勉强的效果图……

一个试图逗猫并抓拍的app

思路

step1.偷偷拍照

step2.吸引注意

效果