自定义控件—自定义的ExpandableTextView

来源：互联网发布：安卓内核优化修改编辑：程序博客网时间：2024/05/22 08:27

这里写图片描述

<LinearLayout xmlns:tools="http://schemas.android.com/tools"    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_margin="8dp"    android:background="#FFFFFF"    android:orientation="vertical"    android:padding="6dp" >    <LinearLayout        android:id="@+id/part2_ll"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <ImageView            android:id="@+id/part2_iv_icon0"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/safeicon0" />        <ImageView            android:id="@+id/part2_iv_icon1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="3dp"            android:src="@drawable/safeicon0" />        <ImageView            android:id="@+id/part2_iv_icon2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="3dp"            android:src="@drawable/safeicon0" />        <View            android:layout_width="0dp"            android:layout_height="1dp"            android:layout_weight="1" />        <ImageView            android:id="@+id/part2_iv_arrow"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/arrow_down" />    </LinearLayout>    <LinearLayout        android:id="@+id/part2_ll_texts"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <TextView            android:id="@+id/part2_ll_text_0"            style="@style/Text_Detail"            android:layout_margin="2dp"            android:drawableLeft="@drawable/safedesurl0"            android:text="正版xxxxxxxxxxxx" />        <TextView               android:id="@+id/part2_ll_text_1"            style="@style/Text_Detail"            android:layout_margin="2dp"            android:drawableLeft="@drawable/safedesurl0"            android:text="正版xxxxxxxxxxxx" />        <TextView            android:id="@+id/part2_ll_text_2"            style="@style/Text_Detail"            android:layout_margin="2dp"            android:drawableLeft="@drawable/safedesurl0"            android:text="正版xxxxxxxxxxxx" />    </LinearLayout></LinearLayout>

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.include_app_detail_part2);        final LinearLayout part2_ll = (LinearLayout) findViewById(R.id.part2_ll);        final ImageView part2_iv_arrow = (ImageView) findViewById(R.id.part2_iv_arrow);        final LinearLayout part2_ll_texts = (LinearLayout) findViewById(R.id.part2_ll_texts);        CollapseUtil.initCollapseAnim(part2_ll,part2_iv_arrow,part2_ll_texts);    }}

** *伸缩工具类 */public class CollapseUtil {    //参数.接受点击事件的条目    //参数:箭头控件    //参数:折叠控件    public static void initCollapseAnim(final LinearLayout bar, final ImageView arrowIv, final LinearLayout collapseView) {        //步骤三。使用measure(0,0)获取 折叠内容的宽高        final int collapseHeight = 0;        ;        //3.1.先测量        collapseView.measure(0, 0);        //3.2获取测量值        final int expandHeight = collapseView.getMeasuredHeight();        //注意 getMeasuredHeight与布局时设置的width height无关。因为它返回的是内容的测量值        collapseView.getLayoutParams().height = collapseHeight;        arrowIv.setImageResource(R.drawable.arrow_down);        collapseView.requestLayout();//view.layout(left,top,right,bottom)        //步骤一。完成点击切换箭头状态        bar.setOnClickListener(new View.OnClickListener() {            private boolean collapse = true;            @Override            public void onClick(View v) {                if (collapse) {                    //折叠状态                    collapse = false;                    arrowIv.setImageResource(R.drawable.arrow_up);                } else {                    collapse = true;                    arrowIv.setImageResource(R.drawable.arrow_down);                }                //步骤二。通过ValueAnimator 逐渐 地修改高度，达到折叠效果                //2.1 依赖 nine old 动画库 compile 'com.nineoldandroids:library:2.4.0'                //LayoutParams 一个布局参数封装。                //2.2 创建属性动画里面的值动画                int fromHeight = 0;                int toHeigith = 0;                fromHeight = collapse ? expandHeight : collapseHeight;                toHeigith = collapse ? collapseHeight : expandHeight;                ValueAnimator valueAnimator = ValueAnimator.ofInt(fromHeight, toHeigith);                //设置定时时间                valueAnimator.setDuration(500);                //2.3.添加一个处理获取更新值的逻辑                valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {                    @Override                    public void onAnimationUpdate(ValueAnimator animation) {                        //2.4 获取变化值 给折叠视图的高度                        Integer newHeight = (Integer) animation.getAnimatedValue();                        collapseView.getLayoutParams().height = newHeight;                        collapseView.requestLayout();//view.layout(left,top,right,bottom)                    }                });                //启动定时器                valueAnimator.start();            }        });    }}

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