Android 使用带有片段的颜色选择器对话框
我正在尝试更新应用程序以使用“材质设计”菜单抽屉。使用我的应用程序几乎可以正常工作,每个片段加载并显示正确的屏幕信息。问题是应用程序的一部分是一个颜色选择器对话框。我似乎再也找不到找到此对话框的页面了。当从主活动运行时,它工作正常,就像我目前在两个应用程序中运行一样。 这是我正在使用的颜色选择器:Android 使用带有片段的颜色选择器对话框,android,android-fragments,Android,Android Fragments,我正在尝试更新应用程序以使用“材质设计”菜单抽屉。使用我的应用程序几乎可以正常工作,每个片段加载并显示正确的屏幕信息。问题是应用程序的一部分是一个颜色选择器对话框。我似乎再也找不到找到此对话框的页面了。当从主活动运行时,它工作正常,就像我目前在两个应用程序中运行一样。 这是我正在使用的颜色选择器: import android.os.Bundle; import android.app.Dialog; import android.content.Context; import android.
import android.os.Bundle;
import android.app.Dialog;
import android.content.Context;
import android.graphics.*;
import android.view.MotionEvent;
import android.view.View;
public class ColorPicker 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);
//sets the size of the outer ring
mPaint.setStrokeWidth(60);
//mPaint.setStrokeWidth(32); original value
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);
}
//changes the size of the color picker
private static final int CENTER_X = 300;
private static final int CENTER_Y = 300;
private static final int CENTER_RADIUS = 200;
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;
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 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);
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;
invalidate();
}
break;
}
return true;
}
}
这里是第109行和第110行,根据上面的日志,110是问题所在——假设我读对了。它们在onclick事件中
ColorPicker font = new ColorPicker( getActivity().getApplication(), this, Color.WHITE);
font.show();
我已经阅读了一些关于使用片段和对话框的帖子,有些来自这里,有些来自其他论坛,给出的答案似乎都不能解决我的问题。如果您能帮我找到答案,我们将不胜感激 不应将
ApplicationContext
用于创建对话框等任务。当您在片段中时,只需调用片段getActivity()
方法即可获得活动上下文
事实上,我也遇到了同样的问题
替换以下行:
ColorPicker font = new ColorPicker( getActivity().getApplication(), this, Color.WHITE);
与
ColorPicker font = new ColorPicker( getActivity(), this, Color.WHITE);
ApplicationContext
不应用于创建对话框等任务。当您在片段中时,只需调用片段getActivity()
方法即可获得活动上下文
事实上,我也遇到了同样的问题
替换以下行:
ColorPicker font = new ColorPicker( getActivity().getApplication(), this, Color.WHITE);
与
ColorPicker font = new ColorPicker( getActivity(), this, Color.WHITE);
@ComSof-我欢迎。@ComSof-我欢迎。