Android仿IOS ViewPager滑動進度條

阿新 • • 發佈：2019-01-13

最近做專案，碰到如下的需求：ViewPager分頁，如果是6頁(包括6頁)就用圓點，如果是6頁以上就用進度條來切換。前面一種互動方法最常見，用小圓點來表示當前選中的頁面，這些小圓點稱為導航點，很多App都是這種實現方式。當用戶第一次安裝或升級應用時，都會利用導航頁面告訴使用者當前版本的主要亮點，一般情況下當行頁面有三部分組成，背景圖片，導航文字和滑動的原點，即下面的效果：

這裡就不作詳細的講解，大家可以參考我以前寫過的部落格：

今天來實現ViewPager進度條切換，主要邏輯如下：

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("當前是第" + page + "頁");
            }
        });
    }
}

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表示沒到邊界，left為到左邊界了，right表示到右邊界了

    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();

                        // 設定滑塊的滑動, 手指第一次點下去把滑塊放到手指上
                        int downLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2;
                        int downTop = mSlideBarBlock.getTop();
                        int downRight = downLeft + mSlideBarBlock.getWidth();
                        int downBottom = mSlideBarBlock.getBottom();

                        //邊界檢測
                        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;
                        }

                        // 設定滑塊的滑動
                        int moveLeft = currentX - mSlideBarBlock.getMeasuredWidth() / 2;
                        int moveTop = mSlideBarBlock.getTop();
                        int moveRight = moveLeft + mSlideBarBlock.getMeasuredWidth();
                        int moveBottom = mSlideBarBlock.getBottom();

                        //邊界處理
                        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;

                        //設定popupWindow的彈出位置
                        if (mOnSlideChangeListener != null) {
                            if (currentPage == mTotalPage) {
                                //防止ViewPager越界
                                currentPage = mTotalPage - 1;
                            }

                            mOnSlideChangeListener.onSlideChange(currentPage);

                            if (mPopupWindow != null) {
                                mPopupText.setText(currentPage + "");

                                //設定PopupWindow的滑動
                                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;
    }
}

相關的單位轉化工具，大家可以拷貝到自己的專案中直接使用。

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);  
    }
}

自定義組合控制元件，然後實現相關的手勢，思路很清晰，程式碼也很詳細，這裡就直接貼程式碼了。

activity_main.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical">

        <com.jackie.slidebarviewdemo.widget.SlideBarView
            android:id="@+id/slide_bar"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"/>

        <TextView
            android:id="@+id/text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="20dp"
            android:textColor="#000"
            android:textSize="20dp"
            android:text="當前是第0頁"/>
    </LinearLayout>
</RelativeLayout>

activity_main.xml

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

    <RelativeLayout
        android:id="@+id/slide_bar_view"
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <View
            android:layout_width="match_parent"
            android:layout_height="5dp"
            android:layout_centerInParent="true"
            android:background="@drawable/shape_slide_bar_bg"/>

        <View
            android:id="@+id/slide_bar_block"
            android:layout_width="20dp"
            android:layout_height="14dp"
            android:background="#b9b9b9"
            android:layout_centerVertical="true" />
    </RelativeLayout>
</RelativeLayout>

popup_window.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout
        android:layout_width="30dp"
        android:layout_height="30dp">
        <TextView
            android:id="@+id/popup_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#fff"
            android:textSize="16dp"
            android:gravity="center"
            android:layout_centerInParent="true" />
    </RelativeLayout>
</RelativeLayout>

附上相關的資原始檔：

shape_slide_bar_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#dcdcdc" />
    <corners android:radius="1dp"/>
</shape>

popup_window_bg.9.png

效果如下：

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