问题描述

我正在尝试让一个垂直搜索栏与模拟器一起使用，但我有点卡住了.我可以让搜索栏以我想要的方式显示，我可以得到进展来做我想做的事，我可以修改onTouchEvent 让拇指垂直而不是水平.我不能做的是让拇指移到外面默认为 29 个水平像素，不使用 setThumbOffset().这在本身不是问题.问题来自于我根本不理解 thumbOffset - 我猜.我想我可以(适当地)调整小部件，我很确定我做的不对.或者也许我可以如果我能弄清楚，只需使用 thumbOffset .既然我可以正确计算进度我以为我只会使用线性小部件的进度函数 * (getTop() - getBottom()) 但那似乎没有这样做.但我无法弄清楚偏移量是多少以周围为中心.

I'm trying to get a vertical seekbar going with the emulator, but I'm sort of stuck. I can get the seekbar to display the way I want it to, and I can get the progress to do what I want, and I can modify the onTouchEvent to get the thumb to go vertically instead of horizontally. What I can't do is get the thumb to move outside of the default 29 horizontal pixels without using setThumbOffset(). This in itself isn't a problem. The problem is coming from the fact that I don't understand the thumbOffset at all -- I guess. I think I could (properly) resize the widget, which I am pretty sure I'm not doing right. Or maybe I could just use the thumbOffset if I could figure it out. Since I can calculate the progress correctly I thought I would just use a linear function of progress * (getTop() - getBottom()) of the widget but that doesn't seem to do it. But I can't figure out what the offset is centered around.

顺便说一句，我真的不确定我在做什么onSizeChanged() 是理智的，或者如果它以后会咬我的屁股开.

As a somewhat aside, I am really unsure if what I am doing in onSizeChanged() is sane or if it's going to bite me in the ass later on.

这是 main.xml 布局:

Here's the main.xml layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <com.mobilsemantic.mobipoll.SlideBar
        android:id="@+id/slide"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:max="100"
        android:progress="0"
        android:secondaryProgress="25" />

        <Button android:id="@+id/button"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:text="Hello, I am a Button" />

    <TextView android:id="@+id/tracking"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

还有类(忽略调试垃圾):

And the class (ignore the debugging junk):

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.SeekBar;

public class SlideBar extends SeekBar {

        private int oHeight = 320, oWidth = 29;
        private int oProgress = -1, oOffset = -1;;
        private float xPos = -1, yPos = -1;
        private int top = -1, bottom = -1, left = -1, right = -1;

        public SlideBar(Context context) {
                super(context);
        }
        public SlideBar(Context context, AttributeSet attrs)
        {
                super(context, attrs);
                oOffset = this.getThumbOffset();
                oProgress = this.getProgress();
        }
        public SlideBar(Context context, AttributeSet attrs, int defStyle)
        {
                super(context, attrs, defStyle);
        }

        protected synchronized void onMeasure(int widthMeasureSpec, intheightMeasureSpec)
        {
                int height = View.MeasureSpec.getSize(heightMeasureSpec);
                oHeight = height;
                this.setMeasuredDimension(oWidth, oHeight);

        }
        protected void onSizeChanged(int w, int h, int oldw, int oldh)
        {
                super.onSizeChanged(h, w, oldw, oldh);
        }
        protected void onLayout(boolean changed, int l, int t, int r, int b)
        {
                super.onLayout(changed, l, t, r, b);
                left = l;
                right = r;
                top = t;
                bottom = b;
        }
        protected void onDraw(Canvas c)
        {
                c.rotate(90);
                c.translate(0,-29);
                super.onDraw(c);
        }
        public boolean onTouchEvent(MotionEvent event)
        {
                xPos = event.getX();
                yPos = event.getY();
                float progress = (yPos-this.getTop())/(this.getBottom()-this.getTop());
                oOffset = this.getThumbOffset();
                oProgress = this.getProgress();
                Log.d("offset" + System.nanoTime(), new Integer(oOffset).toString());
                Log.d("progress" + System.nanoTime(), new Integer(oProgress).toString());

                float offset;

                offset = progress * (this.getBottom()-this.getTop());

                this.setThumbOffset((int)offset);

                Log.d("offset_postsetprogress" + System.nanoTime(), new Integer(oOffset).toString());
                Log.d("progress_postsetprogress" + System.nanoTime(), new Integer(oProgress).toString());

                this.setProgress((int)(100*event.getY()/this.getBottom()));
                return true;
        }

}

推荐答案

对于API 11 及更高版本，可以使用seekbar的XML属性(android:rotation="270") 用于垂直效果.

For API 11 and later, can use seekbar's XML attributes(android:rotation="270") for vertical effect.

<SeekBar
android:id="@+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:rotation="270"/>

对于较旧的 API 级别(前 API10)，请使用:https://github.com/AndroSelva/Vertical-SeekBar-Android 或查看此处示例

For older API level (ex API10),use: https://github.com/AndroSelva/Vertical-SeekBar-Android or see this sample here

您还必须更新它的高度和Iftikhar 建议的宽度

按顺序

seekBar.setLayoutParams(
                new ViewGroup.LayoutParams(convertDpToPixels(1.0f,mContext), ViewGroup.LayoutParams.WRAP_CONTENT));

//没有测试过..

在哪里

public static int convertDpToPixels(float dp, Context context){
    Resources resources = context.getResources();
    return (int) TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_DIP,
            dp, 
            resources.getDisplayMetrics()
    );
}

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