Android 实时屏幕取色 代码实现
时间: 2023-08-06 08:14:01 浏览: 82
Android 实时屏幕取色可以通过使用 MediaProjection API 获取屏幕截图,然后解析像素颜色来实现。
以下是一个简单的示例代码:
1. 首先,需要在 AndroidManifest.xml 文件中添加以下权限:
```xml
<uses-permission android:name="android.permission.READ_FRAME_BUFFER" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
```
2. 然后,在需要获取屏幕颜色的 Activity 中,请求获取屏幕截图的权限:
```java
private static final int REQUEST_MEDIA_PROJECTION = 1;
private MediaProjectionManager mMediaProjectionManager;
private MediaProjection mMediaProjection;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
Intent intent = mMediaProjectionManager.createScreenCaptureIntent();
startActivityForResult(intent, REQUEST_MEDIA_PROJECTION);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_MEDIA_PROJECTION) {
if (resultCode == RESULT_OK) {
mMediaProjection = mMediaProjectionManager.getMediaProjection(resultCode, data);
startCapture();
}
}
}
```
3. 接下来,在 startCapture() 方法中,创建一个 VirtualDisplay 对象来捕获屏幕图像,并将其转换为 Bitmap 对象:
```java
private void startCapture() {
DisplayMetrics metrics = getResources().getDisplayMetrics();
int screenWidth = metrics.widthPixels;
int screenHeight = metrics.heightPixels;
int screenDensity = metrics.densityDpi;
ImageReader imageReader = ImageReader.newInstance(screenWidth, screenHeight, PixelFormat.RGBA_8888, 2);
mMediaProjection.createVirtualDisplay("ScreenCapture",
screenWidth, screenHeight, screenDensity,
DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
imageReader.getSurface(), null, null);
Image image = imageReader.acquireLatestImage();
if (image != null) {
Bitmap bitmap = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Bitmap.Config.ARGB_8888);
Image.Plane[] planes = image.getPlanes();
ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * image.getWidth();
bitmap.copyPixelsFromBuffer(buffer);
image.close();
}
}
```
4. 最后,通过解析 Bitmap 对象的像素值来获取屏幕上指定位置的颜色值:
```java
private int getPixelColor(int x, int y) {
Bitmap bitmap = getScreenShot();
int pixel = bitmap.getPixel(x, y);
bitmap.recycle();
return pixel;
}
```
注意:由于获取屏幕截图的过程比较耗时,建议在子线程中执行上述操作,以免阻塞主线程。