Android 为视图设置重力和填充
我正在寻找如何实现颜色选择器，我发现Android 为视图设置重力和填充,android,Android,我正在寻找如何实现颜色选择器，我发现 关于@Raghunandan的精彩回答，非常有效 唯一的问题是： 我无法将视图集中在dialog上，它始终位于dialog的顶部。我甚至不能设置填充。有人知道我怎么解决这个问题吗 如果可能的话，我怎样才能将对话主题改为Holo（黑色），我的整个应用程序都使用这个主题 [编辑] 代码是： public class ColorPickerDialog extends Dialog { public interface OnColorChangedListen
关于@Raghunandan的精彩回答，非常有效 唯一的问题是： 我无法将视图集中在dialog上，它始终位于dialog的顶部。我甚至不能设置填充。有人知道我怎么解决这个问题吗 如果可能的话，我怎样才能将对话主题改为Holo（黑色），我的整个应用程序都使用这个主题 [编辑] 代码是：
public class ColorPickerDialog extends Dialog {
public interface OnColorChangedListener {
void colorChanged(int color);
}
private OnColorChangedListener mListener;
private int mInitialColor;
private static class ColorPickerView extends View {
private Paint mPaint;
private Paint mCenterPaint;
private final int[] mColors;
private OnColorChangedListener mListener;
ColorPickerView(Context c, OnColorChangedListener l, int color) {
super(c);
mListener = l;
mColors = new int[] {
0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00,
0xFFFFFF00, 0xFFFF0000
};
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setShader(s);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(32);
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(color);
mCenterPaint.setStrokeWidth(5);
}
private boolean mTrackingCenter;
private boolean mHighlightCenter;
@Override
protected void onDraw(Canvas canvas) {
float r = CENTER_X - mPaint.getStrokeWidth()*0.5f;
canvas.translate(CENTER_X, CENTER_X);
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
if (mTrackingCenter) {
int c = mCenterPaint.getColor();
mCenterPaint.setStyle(Paint.Style.STROKE);
if (mHighlightCenter) {
mCenterPaint.setAlpha(0xFF);
} else {
mCenterPaint.setAlpha(0x80);
}
canvas.drawCircle(0, 0,
CENTER_RADIUS + mCenterPaint.getStrokeWidth(),
mCenterPaint);
mCenterPaint.setStyle(Paint.Style.FILL);
mCenterPaint.setColor(c);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X*2, CENTER_Y*2);
}
private static final int CENTER_X = 100;
private static final int CENTER_Y = 100;
private static final int CENTER_RADIUS = 32;
private int floatToByte(float x) {
int n = java.lang.Math.round(x);
return n;
}
private int pinToByte(int n) {
if (n < 0) {
n = 0;
} else if (n > 255) {
n = 255;
}
return n;
}
private int ave(int s, int d, float p) {
return s + java.lang.Math.round(p * (d - s));
}
private int interpColor(int colors[], float unit) {
if (unit <= 0) {
return colors[0];
}
if (unit >= 1) {
return colors[colors.length - 1];
}
float p = unit * (colors.length - 1);
int i = (int)p;
p -= i;
// now p is just the fractional part [0...1) and i is the index
int c0 = colors[i];
int c1 = colors[i+1];
int a = ave(Color.alpha(c0), Color.alpha(c1), p);
int r = ave(Color.red(c0), Color.red(c1), p);
int g = ave(Color.green(c0), Color.green(c1), p);
int b = ave(Color.blue(c0), Color.blue(c1), p);
return Color.argb(a, r, g, b);
}
private int rotateColor(int color, float rad) {
float deg = rad * 180 / 3.1415927f;
int r = Color.red(color);
int g = Color.green(color);
int b = Color.blue(color);
ColorMatrix cm = new ColorMatrix();
ColorMatrix tmp = new ColorMatrix();
cm.setRGB2YUV();
tmp.setRotate(0, deg);
cm.postConcat(tmp);
tmp.setYUV2RGB();
cm.postConcat(tmp);
final float[] a = cm.getArray();
int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);
return Color.argb(Color.alpha(color), pinToByte(ir),
pinToByte(ig), pinToByte(ib));
}
private static final float PI = 3.1415926f;
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX() - CENTER_X;
float y = event.getY() - CENTER_Y;
boolean inCenter = java.lang.Math.sqrt(x*x + y*y) <= CENTER_RADIUS;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mTrackingCenter = inCenter;
if (inCenter) {
mHighlightCenter = true;
invalidate();
break;
}
case MotionEvent.ACTION_MOVE:
if (mTrackingCenter) {
if (mHighlightCenter != inCenter) {
mHighlightCenter = inCenter;
invalidate();
}
} else {
float angle = (float)java.lang.Math.atan2(y, x);
// need to turn angle [-PI ... PI] into unit [0....1]
float unit = angle/(2*PI);
if (unit < 0) {
unit += 1;
}
mCenterPaint.setColor(interpColor(mColors, unit));
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (mTrackingCenter) {
if (inCenter) {
mListener.colorChanged(mCenterPaint.getColor());
}
mTrackingCenter = false; // so we draw w/o halo
invalidate();
}
break;
}
return true;
}
}
public ColorPickerDialog(Context context,
OnColorChangedListener listener,
int initialColor) {
super(context);
mListener = listener;
mInitialColor = initialColor;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
OnColorChangedListener l = new OnColorChangedListener() {
public void colorChanged(int color) {
mListener.colorChanged(color);
dismiss();
}
};
setContentView(new ColorPickerView(getContext(), l, mInitialColor));
setTitle("Pick a Color");
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
width = w;
height = h;
// Move your calculation logic here.
super.onSizeChanged(w, h, oldw, oldh);
}
int centerX = widht / 2;
int centerY = height / 2;
int offset = *Your required view size here* / 2;
canvas.drawOval(new RectF(centerX - offset, 0, centerX + offset, height), mPaint);
canvas.drawCircle(centerX, centerY, CENTER_RADIUS, mCenterPaint);
LinearLayout layout = new LinearLayout(getContext());
YourView view = new ColorPickerView(getContext(), l, mInitialColor);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(*Width of you view or wrap_content*,*height of your view or wrap_content*);
params.gravity = Gravity.CENTER_HORIZONTAL;
view.setLayoutParams(params);
layout.addView(view)
setContentView(layout);
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
width = w;
height = h;
// Move your calculation logic here.
super.onSizeChanged(w, h, oldw, oldh);
}
int centerX = widht / 2;
int centerY = height / 2;
int offset = *Your required view size here* / 2;
canvas.drawOval(new RectF(centerX - offset, 0, centerX + offset, height), mPaint);
canvas.drawCircle(centerX, centerY, CENTER_RADIUS, mCenterPaint);
LinearLayout layout = new LinearLayout(getContext());
YourView view = new ColorPickerView(getContext(), l, mInitialColor);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(*Width of you view or wrap_content*,*height of your view or wrap_content*);
params.gravity = Gravity.CENTER_HORIZONTAL;
view.setLayoutParams(params);
layout.addView(view)
setContentView(layout);
你能把你的密码寄出去吗？还是看看这个？当您将视图设置为对话框的内容时，它将填充所有可用空间。如果希望视图居中，则应修改onDraw（）逻辑，以便在给定空间的中心绘制（而不是从0；0开始）。@veselin todorov How？你能举个例子吗，我对这方面还不熟悉。谢谢你能把你的密码寄出去吗？还是看看这个？当您将视图设置为对话框的内容时，它将填充所有可用空间。如果希望视图居中，则应修改onDraw（）逻辑，以便在给定空间的中心绘制（而不是从0；0开始）。@veselin todorov How？你能举个例子吗，我对这方面还不熟悉。谢谢