可滑动可点击,不占全屏的自定义控件

来源：互联网发布：java注解的使用编辑：程序博客网时间：2024/04/29 12:44
这里写图片描述
因为第一次发文字,有些地方还不是很懂就没发全.以后改进
这是一个自定义的HorizontalScrollView,能够在屏幕上只显示部分控件.可以进行点击滑动等操作.当然有其他需求的可以直接加.本人水平一般,有问题的地方欢迎指教,互相交流…
下面就直接上代码
package com.example.ljy.demo_1;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.HorizontalScrollView;import android.widget.LinearLayout;import android.widget.ScrollView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private static final String TAG = "MainActivity";    LinearLayout llContain;    ScrollLinearLayout scroll;    private String[] str = {"我是测试1", "我是测试1", "我是测试", "呵呵哈嘿", "哼哼哈嘿", "哼哼哈嘿1", "哼哼哈嘿1"};    private int mWidth;    private int mTvWidth;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mWidth = getWindowManager().getDefaultDisplay().getWidth();        llContain = findViewById(R.id.ll_contain);        scroll = findViewById(R.id.scroll);        llContain.setBackgroundColor(Color.RED);        initView();        scroll.setWindowWidth(mWidth);    }    /**     * 初始化子控件,并添加到容器里面去     */    private void initView() {        for (int i = 0; i < str.length; i++) {            TextView tv = new TextView(this);            tv.setText(str[i]);            tv.setTextColor(Color.WHITE);            Log.d(TAG, "width: " + mWidth);            mTvWidth = (int) (mWidth / 5 + 0.5);            Log.d(TAG, "width: " + mTvWidth);            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(mTvWidth, 30);            tv.setPadding(3,0,3,0);//            params.leftMargin = 3;//            params.rightMargin = 3;            llContain.addView(tv, params);            //判定如果不是需要的就隐藏,但是需要占位置,能够保证滑动,并且取消当前的点击事件            if (i < 2 || i > 4) {                tv.setVisibility(View.INVISIBLE);                tv.setEnabled(false);            }            final int finalI = i;            //在这里设置点击事件.可以直接点击,只给3个设置了点击事件            tv.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    switch (finalI){                        case 2:                            scroll.scrollTo(0,0);                            break;                        case 3:                            scroll.scrollTo(mTvWidth,0);                            break;                        case 4:                            scroll.scrollTo(mTvWidth*2,0);                            break;                    }                    int scrollX = scroll.getScrollX();                    Log.d(TAG, "onClick:scrollX " + scrollX);                }            });        }        int childCount = llContain.getChildCount();        Toast.makeText(this, "childCount: " + childCount, Toast.LENGTH_SHORT).show();        Log.d(TAG, "childCount: " + childCount);    }}---------------------------------------------------------<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#88000000"    android:orientation="vertical"    tools:context="com.example.ljy.demo_1.MainActivity">    <ImageView android:layout_width="match_parent"               android:layout_height="wrap_content"               android:gravity="center_horizontal"               android:src="@drawable/white_point"/>    <com.example.ljy.demo_1.ScrollLinearLayout        android:id="@+id/scroll"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="#f00"        android:scrollbars="none">        <LinearLayout android:id="@+id/ll_contain"                      android:layout_width="match_parent"                      android:layout_height="wrap_content"                      android:orientation="horizontal">        </LinearLayout>    </com.example.ljy.demo_1.ScrollLinearLayout></LinearLayout>-------------------------------------------------------下面的是自定义的是HorizontalScrollViewpackage com.example.ljy.demo_1;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.HorizontalScrollView;import android.widget.LinearLayout;import android.widget.ScrollView;import static android.R.attr.scrollX;import static android.R.attr.x;import static android.R.attr.y;/** * Created by ljy on 2017/9/29. */public class ScrollLinearLayout extends HorizontalScrollView {    private static final String TAG = "ScrollLinearLayout";    private int width;    private int mScrollX;    public ScrollLinearLayout(Context context) {        super(context);    }    public ScrollLinearLayout(Context context, AttributeSet attrs) {        super(context, attrs);    }    public ScrollLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public float rawX;    int widowWidth;    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        LinearLayout childAt = (LinearLayout) getChildAt(0);        int width = childAt.getChildAt(3).getWidth();        int width2 = width*2;        int a = (int) (width / 2 + 0.5);        int b = (int) (width * 1.5 + 0.5);        switch (ev.getAction()) {            case MotionEvent.ACTION_DOWN:                rawX = ev.getRawX();                Log.d(TAG, "rawX: " + rawX);                mScrollX = getScrollX();                break;            case MotionEvent.ACTION_MOVE:                break;            case MotionEvent.ACTION_UP:                //在抬起的事件里面,去判定按下时的滚动位置,以及手指滑动的距离,并通过距离的判断,来区分滑动到那个位置                float upRawX = ev.getRawX();                int diffX = (int) (upRawX - rawX + 0.5);                Log.d(TAG, "dispatchTouchEvent:diffX " + diffX);                Log.d(TAG, "scrollX: " + mScrollX);                Log.d(TAG, "dispatchTouchEvent: a " + a + " b " + b);                if (diffX >= a && diffX <= b) { //向右 移动了一格                    if (mScrollX == 0) {                        //不动                        scrollTo(0, 0);                    } else if (mScrollX < width2 && mScrollX > 0) {                        scrollTo(0, 0);                    } else {                        scrollTo(width, 0);                    }                } else if (diffX > b) {//向右 移动了2格                    if (mScrollX == 0) {                        //不动                        scrollTo(0, 0);                    } else if (mScrollX < width2 && mScrollX > 0) {                        //滑动到第一个                        scrollTo(0, 0);                    } else {                        //滑动到第一个                        scrollTo(0, 0);                    }                } else if (diffX > -a && diffX < a) { //不动                    if (mScrollX == 0) {                        //不动                        scrollTo(0, 0);                    } else if (mScrollX < width2 && mScrollX > 0) {                        scrollTo(width, 0);                    } else {                        scrollTo(width2, 0);                    }                } else if (diffX <= -a && diffX >= -b) {//向左 移动了一格                    if (mScrollX == 0) {                        //滑动到第2个                        scrollTo(width, 0);                    } else if (mScrollX < width2 && mScrollX > 0) {                        //滑动到第3个                        scrollTo(width2, 0);                    } else {                        //滑动到第3个                        scrollTo(width2, 0);                    }                } else if (diffX < -b) {//向左 移动了2格                    if (mScrollX == 0) {                        //滑动到第3个                        scrollTo(width2, 0);                    } else if (mScrollX < width2 && mScrollX > 0) {                        //滑动到第3个                        scrollTo(width2, 0);                    } else {                        //滑动到第3个                        scrollTo(width2, 0);                    }                }                break;        }        return super.dispatchTouchEvent(ev);    }    public void setWindowWidth(int width) {        this.widowWidth = width;    }}
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