发表更新Kotlin-Android3 分钟读完 (大约394个字)

实习笔记-3

在安卓中显示gif图片

使用WebView

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<WebView
    android:id="@+id/runWebView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true" />
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runWebView.loadDataWithBaseURL(null,
"<html>
    <body bgcolor='#f3f3f3'>
        <div align=center>
            <IMG src='file:///android_asset/run.gif'/>
        </div>
    </body>
</html>", "text/html", "UTF-8",null);

实现底部状态栏

使用recyclerview + gridlayoutmanager

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val rc_btm_navi = findViewById<RecyclerView>(R.id.rc_btm_navi)
rc_btm_navi.layoutManager = GridLayoutManager(this,1).apply {
    orientation = GridLayoutManager.HORIZONTAL
}
rc_btm_navi.adapter = navi_adapter()

adaper中获取屏幕宽度，创建view时设置view的宽度

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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): view_holder {
    val view: View =
        LayoutInflater.from(parent.context)
            .inflate(
                R.layout.item_navi,
                parent,
                false
            )
    view.layoutParams.width = getScreenWidth(activity) / navi_arr.size
    return view_holder(view)
}

自定义下拉刷新(没学会)

  • TRANSLUCENT 半透明

rectF类

Rect F holds four float coordinates for a rectangle . The rectangle
is represented by the coordinates of its 4 edges ( left , top , right
bottom ). These fields can be accessed directly . Use width () and
height () to retrieve the rectangle ’ s width and height . Note :
most methods do not check to see that the coordinates are sorted
correctly ( i . e . left <= right and top <= bottom ).

ViewFlipper(翻转视图)

  • 就是首次安装软件后的功能介绍页面

使用

导入图片

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<ViewFlipper
    android:id="@+id/vflp_help"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:inAnimation="@anim/right_in"
    android:outAnimation="@anim/right_out"
    android:flipInterval="3000">

    <include layout="@layout/page_help_one" />
    <include layout="@layout/page_help_two" />
    <include layout="@layout/page_help_three" />
    <include layout="@layout/page_help_four" />
    <!--此处为静态导入-->

</ViewFlipper>
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//动态导入
for(int i = 0;i < resId.length;i++){
    vflp_help.addView(getImageView(resId[i]));
}
private ImageView getImageView(int resId){
    ImageView img = new ImageView(this);
    img.setBackgroundResource(resId);
    return img;
}

翻动

手动翻动
  • 自定义一个GestureListener
  • 创建一个GestureDetector
  • 重写activity的onTouchEvent
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    private class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float v, float v1) {
            if(e1.getX() - e2.getX() > MIN_MOVE){
                vflp_help.setInAnimation(mContext,R.anim.right_in);
                vflp_help.setOutAnimation(mContext, R.anim.right_out);
                vflp_help.showNext();
            }else if(e2.getX() - e1.getX() > MIN_MOVE){
                vflp_help.setInAnimation(mContext,R.anim.left_in);
                vflp_help.setOutAnimation(mContext, R.anim.left_out);
                vflp_help.showPrevious();
            }
            return true;
        }
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return mDetector.onTouchEvent(event);
    }
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//自动翻动
vflp_help.startFlipping();

fragment中实现触摸事件

参考

实习笔记-3

https://jingtianer.github.io/home/2022/03/22/Kotlin-Android学习笔记/2022年1月14日/

作者

Meow Meow Liu

发布于

2022-03-22

更新于

2025-04-15

许可协议

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