最近做项目，碰到如下的需求：ViewPager分页，如果是6页(包括6页)就用圆点，如果是6页以上就用进度条来切换。前面一种交互方法最常见，用小圆点来表示当前选中的页面，这些小圆点称为导航点，很多App都是这种实现方式。当用户第一次安装或升级应用时，都会利用导航页面告诉用户当前版本的主要亮点，一般情况下当行页面有三部分组成，背景图片，导航文字和滑动的原点，即下面的效果：
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这里就不作详细的讲解，大家可以参考我以前写过的博客：
ViewPager实现图片轮翻效果
今天来实现ViewPager进度条切换，主要逻辑如下：
MainActivity.java
package com.jackie.slidebarviewdemo.activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import com.jackie.slidebarviewdemo.R;
import com.jackie.slidebarviewdemo.widget.SlideBarView;
public class MainActivity extends AppCompatActivity {
private SlideBarView mSlideBarView;
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSlideBarView = (SlideBarView) findViewById(R.id.slide_bar);
mTextView = (TextView) findViewById(R.id.text_view);
mSlideBarView.setTotalPage(80);
mSlideBarView.setOnSlideChangeListener(new SlideBarView.OnSlideChangeListener() {
@Override
public void onSlideChange(int page) {
mTextView.setText("当前是第" + page + "页");
}
});
}
}
SlideBarView.java
package com.jackie.slidebarviewdemo.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.jackie.slidebarviewdemo.R;
import com.jackie.slidebarviewdemo.utils.ConvertUtils;
/**
* Created by Jackie on 2017/1/17.
*/
public class SlideBarView extends RelativeLayout {
private LayoutInflater mInflater;
private RelativeLayout mSlideBarView;
private View mSlideBarBlock;
private PopupWindow mPopupWindow;
private TextView mPopupText;
private int mDp40;
private String mBound = "no"; // no表示没到边界，left为到左边界了，right表示到右边界了
public interface OnSlideChangeListener {
void onSlideChange(int page);
}
private OnSlideChangeListener mOnSlideChangeListener;
public void setOnSlideChangeListener(OnSlideChangeListener onSlideChangeListener) {
this.mOnSlideChangeListener = onSlideChangeListener;
}
public SlideBarView(Context context) {
this(context, null);
}
public SlideBarView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SlideBarView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
initEvent();
}
private void init(Context context) {
mInflater = LayoutInflater.from(context);
View slideBar = mInflater.inflate(R.layout.slide_bar, null);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
addView(slideBar, params);
mSlideBarView = (RelativeLayout) slideBar.findViewById(R.id.slide_bar_view);
mSlideBarBlock = slideBar.findViewById(R.id.slide_bar_block);
mDp40 = ConvertUtils.dip2px(context, 40);
}
private void initEvent() {
mSlideBarView.setOnTouchListener(new OnTouchListener() {
int currentX = 0;
int startX = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
currentX = (int) event.getX();
startX = (int) event.getX();
// 设置滑块的滑动, 手指第一次点下去把滑块放到手指上
int downLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2;
int downTop = mSlideBarBlock.getTop();
int downRight = downLeft + mSlideBarBlock.getWidth();
int downBottom = mSlideBarBlock.getBottom();
//边界检测
if (downLeft < 0) {
downLeft = 0;
downRight = mSlideBarBlock.getMeasuredWidth();
} else if (downRight > mSlideBarView.getMeasuredWidth()) {
downLeft = mSlideBarView.getMeasuredWidth() - mSlideBarBlock.getMeasuredWidth();
downRight = mSlideBarView.getMeasuredWidth();
}
mSlideBarBlock.layout(downLeft, downTop, downRight, downBottom);
break;
case MotionEvent.ACTION_MOVE:
currentX = (int) event.getX();
int currentPage = currentX * mTotalPage / mSlideBarView.getMeasuredWidth();
if (currentPage < 0) {
currentPage = 0;
} else if (currentPage > mTotalPage) {
currentPage = mTotalPage;
}
// 设置滑块的滑动
int moveLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2;
int moveTop = mSlideBarBlock.getTop();
int moveRight = moveLeft + mSlideBarBlock.getMeasuredWidth();
int moveBottom = mSlideBarBlock.getBottom();
//边界处理
if (moveLeft < 0) {
mBound = "left";
moveLeft = 0;
moveRight = mSlideBarBlock.getMeasuredWidth();
} else if (moveRight >= mSlideBarView.getMeasuredWidth()) {
mBound = "right";
moveLeft = mSlideBarView.getMeasuredWidth() - mSlideBarBlock.getMeasuredWidth();
moveRight = mSlideBarView.getMeasuredWidth();
} else {
mBound = "no";
}
mSlideBarBlock.layout(moveLeft, moveTop, moveRight, moveBottom);
startX = currentX;
//设置popupWindow的弹出位置
if (mOnSlideChangeListener != null) {
if (currentPage == mTotalPage) {
//防止ViewPager越界
currentPage = mTotalPage - 1;
}
mOnSlideChangeListener.onSlideChange(currentPage);
if (mPopupWindow != null) {
mPopupText.setText(currentPage + "");
//设置PopupWindow的滑动
if (!mPopupWindow.isShowing()) {
int[] location = new int[2];
mSlideBarView.getLocationInWindow(location);
mPopupWindow.showAsDropDown(mSlideBarView, currentX, location[1] - mDp40);
} else {
if ("no".equals(mBound)) {
int[] location = new int[2] ;
mSlideBarView.getLocationInWindow(location);
mPopupWindow.update(currentX, location[1] - mDp40, mPopupWindow.getWidth(), mPopupWindow.getHeight(), true);
}
}
}
}
break;
case MotionEvent.ACTION_UP:
currentX = 0;
startX = 0;
mPopupWindow.dismiss();
break;
}
return true;
}
});
// 初始化PopupWindow
View contentView = mInflater.inflate(R.layout.popup_window, null);
mPopupText = (TextView) contentView.findViewById(R.id.popup_text);
mPopupWindow = new PopupWindow(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
mPopupWindow.setContentView(contentView);
mPopupWindow.setOutsideTouchable(true);
mPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.mipmap.popup_window_bg));
mPopupWindow.setAnimationStyle(0);
}
int mTotalPage = 0;
public void setTotalPage(int totalPage) {
this.mTotalPage = totalPage;
}
}
相关的单位转化工具，大家可以拷贝到自己的项目中直接使用。
ConvertUtils.java
package com.jackie.slidebarviewdemo.utils;
import android.content.Context;
public class ConvertUtils {
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
public static int px2sp(Context context, float pxValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (pxValue / fontScale + 0.5f);
}
public static int sp2px(Context context, float spValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
}
自定义组合控件，然后实现相关的手势，思路很清晰，代码也很详细，这里就直接贴代码了。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
popup_window.xml
<?xml version="1.0" encoding="utf-8"?>
附上相关的资源文件：
shape_slide_bar_bg.xml
<?xml version="1.0" encoding="utf-8"?>
popup_window_bg.9.png
效果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。