我试图弄清楚如何使用来自http://developer.android.com/reference/android/graphics/Color.html的 argb 方法。
我已经多次阅读它,但我仍然无法让这个应用程序正常工作。我试图让 View 小部件显示通过移动 4 个滑块产生的颜色,但无论我将滑块放在哪里都不会显示颜色。我认为 argb 方法会返回一个值colorValue
,我可以将其用作颜色吗?任何建议,将不胜感激!
我的主要课程如下所示:
public class ColorChooserActivity extends Activity
implements OnSeekBarChangeListener {
//variables
private SeekBar redSeekBar;
private SeekBar greenSeekBar;
private SeekBar blueSeekBar;
private SeekBar alphaSeekBar;
private View colorView;
private TextView colorTextView;
//instanced variables
private static int colorValue = 0;
private int RedValue = 0;
private int GreenValue = 0;
private int BlueValue =0;
private int AlphaValue =0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_color_chooser);
//reference to widgets
redSeekBar = (SeekBar) findViewById(R.id.redSeekBar);
greenSeekBar = (SeekBar) findViewById(R.id.greenSeekBar);
blueSeekBar = (SeekBar) findViewById(R.id.blueSeekBar);
alphaSeekBar = (SeekBar) findViewById(R.id.alphaSeekBar);
colorView = (View) findViewById(R.id.colorView);
colorTextView = (TextView) findViewById(R.id.colorTextView);
//listener
redSeekBar.setOnSeekBarChangeListener(this);
greenSeekBar.setOnSeekBarChangeListener(this);
blueSeekBar.setOnSeekBarChangeListener(this);
alphaSeekBar.setOnSeekBarChangeListener(this);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
int RedValue = redSeekBar.getProgress();
int GreenValue = greenSeekBar.getProgress();
int BlueValue = blueSeekBar.getProgress();
int AlphaValue = alphaSeekBar.getProgress();
argb(AlphaValue, RedValue, GreenValue, BlueValue);
colorView.setBackgroundColor(colorValue);
String rgbValue = Integer.toString(progress);
colorTextView.setText(rgbValue);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar){
}
public static int argb (int alpha, int red, int green, int blue){
return colorValue;
}
}