前言

本篇比较简单，只是一个搜索组件简单的封装

实现

Java代码如下：

package com.floruit.cxy.view.widget;

import android.app.Activity;
import android.content.Context;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

import androidx.annotation.Nullable;

import com.floruit.cxy.R;

import static android.content.Context.INPUT_METHOD_SERVICE;

/**
 * 搜索组件
 */
public class SearchView extends LinearLayout {

    private String hint = "请输入关键词";
    private EditText et_input;
    private ImageView iv_del;

    private SearchChangeListener searchChangeListener;

    public SearchView(Context context) {
        super(context);
        initView(context,null);
    }

    public SearchView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initView(context,attrs);
    }

    public SearchView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context,attrs);
    }

    public void setSearchListener(SearchChangeListener searchListener){
        this.searchChangeListener = searchListener;
    }

    public void setSearchText(String searchText){
        if(TextUtils.isEmpty(searchText)) return;
        et_input.setText(searchText);
        et_input.setSelection(searchText.length());
    }

    private void initView(Context context, AttributeSet attrs) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_search_view,this,true);
        et_input = view.findViewById(R.id.et_input);
        iv_del = view.findViewById(R.id.iv_del);
        setListener();
    }

    private void setListener() {
        et_input.setOnKeyListener(new View.OnKeyListener() {//点击搜索按钮监听事件
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                //是否是回车键
                if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
                    //隐藏键盘
                    ((InputMethodManager) getContext().getSystemService(INPUT_METHOD_SERVICE))
                            .hideSoftInputFromWindow(((Activity)getContext()).getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
                    et_input.clearFocus();
                    //搜索
                    if(searchChangeListener != null){
                        searchChangeListener.onSearchChanged(et_input.getText().toString().trim());
                    }
                }
                return false;
            }
        });

        et_input.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(searchChangeListener != null){
                    searchChangeListener.onTextChanged(s.toString().trim());
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                if (!TextUtils.isEmpty(s.toString().trim())) {
                    iv_del.setVisibility(View.VISIBLE);
                } else {
                    iv_del.setVisibility(View.GONE);
                }
            }
        });

        iv_del.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                et_input.setText("");
            }
        });
    }

    public interface SearchChangeListener{

        void onSearchChanged(String keyWord);

        void onTextChanged(String keyWord);

    }

}

布局文件如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/ll_search"
    android:layout_width="match_parent"
    android:layout_height="31dp"
    android:layout_below="@+id/ll_simple_info"
    android:background="@drawable/white_search_bg"
    android:orientation="horizontal"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <ImageView
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_gravity="center_vertical"
        android:layout_marginStart="12dp"
        android:layout_marginEnd="4dp"
        android:src="@mipmap/search_icon"/>
    <EditText
        android:id="@+id/et_input"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="30dp"
        android:layout_marginEnd="15dp"
        android:layout_gravity="center_vertical"
        android:hint="请输入关键词"
        android:textColorHint="@color/search_hint"
        android:textSize="14sp"
        android:textColor="@color/black_2a"
        android:background="@color/white"
        android:gravity="start|center_vertical"
        android:imeOptions="actionSearch"
        android:singleLine="true"/>
    <ImageView
        android:id="@+id/iv_del"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:src="@mipmap/search_close"
        android:layout_marginEnd="@dimen/dp_10"
        android:visibility="gone"/>
</LinearLayout>

其实很多组件的封装并不复杂，就是一个封装的思想，让项目中使用起来方便，可复用，业务逻辑清晰，易维护。

当然也有很多酷炫难度较高的自定义控件，这个是需要很多技术技巧的，慢慢学习和积累也是可以做到的。