我正在创建一个涉及获取部分屏幕颜色的应用程序。为此,我使用 Bitmap.getPixel 方法来检索屏幕的指定像素,而不是将其转换为 RGB 格式,以便我以后更容易编写代码。问题是当我使用 getPixel 方法时,无论屏幕上显示什么,它总是返回相同的 RGB 值,R:0 G:0 B:0 或黑色,即使有一个灰色按钮覆盖整个屏幕!这是代码
package proof.of.concept;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.widget.*;
public class ColorCheckerProofOfConcept extends Activity {
private static final String TAG = "ColorChckerProofOfConcept:: ";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
Log.d(TAG, "Width and Height Retrieved As: " + width + ", " + height);
Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config. RGB_565);
String hexValue;
int test;
test = b.getPixel(240, 350);
hexValue = Integer.toHexString(test);
Log.d(TAG, "pixel at 100, 200 succesfully retreived! with value of: " + test);
Log.d(TAG, "and an Hex value of: " + hexValue);
int blue = Color.blue(test);
int red = Color.red(test);
int green = Color.green(test);
//this is a modification
Log.d(TAG, "RGB COLOR! R:" + red + " G:" + green + " B:" + blue);
}
});
}
}