之前寫過自定義加減控件的文章，大家可以看看
仿美團外賣自定義加減控件(二)
然后個人覺得將“加號事件”，“減號事件”和“輸入事件”放一起處理不好，還是需要給個type來區(qū)分下比較好，此篇文章算是對仿美團外賣自定義加減控件(二)文章的一個優(yōu)化吧。

下面就來具體講講代碼的實現(xiàn)。

第一步，先上一個最低得輸入一位數(shù)的輸入框代碼，F(xiàn)orbidenNumEditText

代碼如下：

package com.test.ui.main;

import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;

import com.test.util.StringUtil;

/**
 * Instruction:當(dāng)edtText中的位數(shù)為1時，禁用刪除鍵
 * <p>
 * Author:pei
 * Date: 2017/7/26
 * Description:
 */


public class ForbidenNumEditText extends android.support.v7.widget.AppCompatEditText{

    public ForbidenNumEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /**
     * If you handled the event, return true <br>
     * If you want to allow the event to be handled by the next receiver, return false.
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        //屏蔽刪除鍵(保留edittext最低位數(shù)為1)
        if (keyCode == KeyEvent.KEYCODE_DEL) {
            String content= ForbidenNumEditText.this.getText().toString();
            if(StringUtil.isNotEmpty(content)&&content.length()==1){
                return false;//不管返回false還是true都會把del鍵盤屏蔽,不同的是false會繼續(xù)傳入到Activity中
            }
        }
        return super.onKeyDown(keyCode, event);
    }
}

第二步，上自定義加減控件代碼CicleAddAndSubView

package com.test.ui.main;

import android.content.Context;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.test.R;
import com.test.util.KeyboardUtil;

/**
 * Instruction:自定義加減數(shù)量控件
 * <p>
 * Author:pei
 * Date: 2017/7/13
 * Description:
 */


public class CicleAddAndSubView extends LinearLayout implements View.OnClickListener{

    public static final int TYPE_SUBTRACT = 0;//減
    public static final int TYPE_ADD = 1;//加
    public static final int TYPE_INPUT =2;//輸入框輸入事件
    private static final int DEFAULT_NUM=0;//默認(rèn)num值
    private static final int MAX_NUM=999;


    private View mLayoutView;
    private Context mContext;
    private ImageView mBtnAdd;//加按鈕
    private ImageView mBtnSub;//減按鈕
    private EditText mEdtCount;//數(shù)量顯示
    private OnNumChangeListener mOnNumChangeListener;

    private int mType=-1;

    /**
     * 設(shè)置監(jiān)聽回調(diào)
     *
     * @param onNumChangeListener
     */
    public void setOnNumChangeListener(OnNumChangeListener onNumChangeListener) {
        this.mOnNumChangeListener = onNumChangeListener;
    }

    public CicleAddAndSubView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mLayoutView=LayoutInflater.from(context).inflate(R.layout.add_sub_view, this);
        this.mContext=context;

        initView();
        initData();
        setListener();
    }

    private void initView(){
        mBtnAdd = (ImageView) mLayoutView.findViewById(R.id.btn_add);
        mBtnSub = (ImageView) mLayoutView.findViewById(R.id.btn_sub);
        mEdtCount = (ForbidenNumEditText) mLayoutView.findViewById(R.id.edt_count);

        //重新設(shè)置mBtnAdd，mBtnSub寬高，用來保證顯示正方形
        setViewSize(mBtnAdd);
        setViewSize(mBtnSub);
    }

    private void initData(){
        setAddBtnImageResource(R.mipmap.ic_add_goods);
        setSubBtnImageResource(R.mipmap.ic_sub_goods);
        setNum(DEFAULT_NUM);//設(shè)置默認(rèn)數(shù)量
    }

    private void setListener(){
        mBtnAdd.setOnClickListener(this);
        mBtnSub.setOnClickListener(this);

        mEdtCount.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                mType=TYPE_INPUT;
                return false;
            }
        });

        mEdtCount.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //s:變化前的所有字符； start:字符開始的位置； count:變化前的總字節(jié)數(shù)；after:變化后的字節(jié)數(shù)
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                //S：變化后的所有字符；start：字符起始的位置；before: 變化之前的總字節(jié)數(shù)；count:變化后的字節(jié)數(shù)


            }

            @Override
            public void afterTextChanged(Editable s) {
                //Editable s:變化后的所有字符
                if (mOnNumChangeListener != null) {
                    mOnNumChangeListener.onNumChange(mLayoutView,mType,getNum());
                }
            }
        });
    }

    private void setViewSize(final View view){
        view.post(new Runnable(){
            public void run() {//這里獲取寬高
                int width=view.getWidth();
                int height=view.getHeight();

                LayoutParams params= (LayoutParams) view.getLayoutParams();
                if(width<height){
                    params.height=width;
                }else if(width>height){
                    params.width=height;
                }
                view.setLayoutParams(params);
            }
        });
    }

    @Override
    public void onClick(View v) {
        //隱藏軟鍵盤
        KeyboardUtil.closeKeybord(v,mContext);

        String countText = mEdtCount.getText().toString();
        if (TextUtils.isEmpty(countText)) {
            setNum(DEFAULT_NUM);
            return;
        }
        int num=DEFAULT_NUM;
        try {
            num=Integer.valueOf(mEdtCount.getText().toString());
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
        switch(v.getId()){
            case R.id.btn_add://加號
                mType=TYPE_ADD;

                if(num>=MAX_NUM){
                    num=MAX_NUM;
                }else{
                    num++;
                }
                setNum(num);
                break;
            case R.id.btn_sub://減號
                mType=TYPE_SUBTRACT;

                num--;
                setNum(num);
                break;
            default:
                break;
        }
    }


    /**
     * 設(shè)置中間的距離
     *
     * @param distance
     */
    public void setMiddleDistance(int distance) {
        mEdtCount.setPadding(distance, 0, distance, 0);
    }

    /**
     * 設(shè)置數(shù)量
     *
     * @param num
     */
    public void setNum(int num) {
        if (num > 0) {
            mBtnSub.setVisibility(View.VISIBLE);
            mEdtCount.setVisibility(View.VISIBLE);
        } else {
            mBtnSub.setVisibility(View.INVISIBLE);
            mEdtCount.setVisibility(View.INVISIBLE);
        }
        mEdtCount.setText(String.valueOf(num));
        //光標(biāo)設(shè)置在結(jié)尾
        mEdtCount.setSelection(mEdtCount.getText().length());
    }

    /**
     * 獲取值
     *
     * @return
     */
    public int getNum() {
        String countText=mEdtCount.getText().toString().trim();
        if (!TextUtils.isEmpty(countText)) {
            return Integer.parseInt(countText);
        } else {
            return DEFAULT_NUM;
        }
    }

    /**
     * 設(shè)置加號圖片
     *
     * @param addBtnDrawable
     */
    public void setAddBtnImageResource(int addBtnDrawable) {
        mBtnAdd.setImageResource(addBtnDrawable);
    }

    /**
     * 設(shè)置減法圖片
     *
     * @param subBtnDrawable
     */
    public void setSubBtnImageResource(int subBtnDrawable) {
        mBtnSub.setImageResource(subBtnDrawable);
    }

    /**
     * 設(shè)置加法減法的背景色
     *
     * @param addBtnColor
     * @param subBtnColor
     */
    public void setButtonBgColor(int addBtnColor, int subBtnColor) {
        mBtnAdd.setBackgroundColor(addBtnColor);
        mBtnSub.setBackgroundColor(subBtnColor);
    }

    public interface OnNumChangeListener {
        /**
         * 監(jiān)聽方法
         *
         * @param view
         * @param num   返回的數(shù)值
         */
        void onNumChange(View view, int type,int num);
    }

}

涉及到的布局add_sub_view.xml代碼如下：

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

    <ImageView
        android:id="@+id/btn_sub"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <com.test.ui.main.ForbidenNumEditText
        android:id="@+id/edt_count"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:inputType="number"
        android:gravity="center"
        android:singleLine="true"
        android:maxLines="1"
        android:maxLength="3"
        android:layout_margin="5dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:background="@drawable/add_sub_edt_bg"
        android:text="0"
        android:textColor="@color/black"
        android:textSize="16sp"/>

    <ImageView
        android:id="@+id/btn_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

講下CicleAddAndSubView的思路吧，我是設(shè)置加號，減號的點擊事件，然后為了監(jiān)聽editText的輸入事件，我在ForbidenNumEditText的onTouch事件上設(shè)置type值。最后，為了確保用戶每次都去touch我們的ForbidenNumEditText，我在加號，減號事件中加入隱藏軟鍵盤的代碼。下面，為大家展示隱藏鍵盤的代碼KeyboardUtil.java

第三步，隱藏鍵盤的代碼

package com.test.util;

import android.app.Activity;
import android.content.Context;
import android.text.InputType;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 軟鍵盤面的顯示隱藏類
 * 
 * @author pei
 */
public class KeyboardUtil {
    
    /** 打開軟鍵盤 **/
    public static void openKeybord(View view, Context mContext) {
        InputMethodManager imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(view, InputMethodManager.RESULT_SHOWN);
        imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
    }

    /** 關(guān)閉軟鍵盤 **/
    public static void closeKeybord(View view, Context mContext) {
        InputMethodManager imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }
    
    /**
     * 獲取軟件盤狀態(tài)
     * 若返回true，則表示輸入法打開 
     * @param mContext
     * @return 
     */
    public static boolean isKeybordOpen(Context mContext){
        boolean isOpen=false;
        InputMethodManager imm = (InputMethodManager)mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
        isOpen=imm.isActive();//isOpen若返回true，則表示輸入法打開 
        return isOpen;
    }
    
    /**如果有軟鍵盤，那么隱藏它，反之，把它顯示出來**/
    public static void changeKeybord(Context mContext){
        InputMethodManager imm = (InputMethodManager)mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
        //2.調(diào)用toggleSoftInput方法，實現(xiàn)切換顯示軟鍵盤的功能。
        imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
    }
    
    /** 隱藏系統(tǒng)如那件盤(根據(jù)sdk版本判斷來隱藏軟鍵盤,完全隱藏，再也不出現(xiàn)) **/
    public static void hideSoftInputMethod(EditText ed, Activity activity) {
        activity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
        int currentVersion = android.os.Build.VERSION.SDK_INT;
        String methodName = null;
        if (currentVersion >= 16) {
            // 4.2
            methodName = "setShowSoftInputOnFocus";
        } else if (currentVersion >= 14) {
            // 4.0
            methodName = "setSoftInputShownOnFocus";
        }

        if (methodName == null || currentVersion <= 10) {
            ed.setInputType(InputType.TYPE_NULL);
        } else {
            Class<EditText> cls = EditText.class;
            Method setShowSoftInputOnFocus;
            try {
                setShowSoftInputOnFocus = cls.getMethod(methodName, boolean.class);
                setShowSoftInputOnFocus.setAccessible(true);
                setShowSoftInputOnFocus.invoke(ed, false);
            } catch (NoSuchMethodException e) {
                ed.setInputType(InputType.TYPE_NULL);
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

第四步，在mainActivity的布局activity_main.xml中引用控件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/black"
        android:layout_gravity="center"
        android:textSize="14sp"
        android:text="測試"/>

   <com.test.ui.main.CicleAddAndSubView
       android:id="@+id/cicle_view"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"/>
</LinearLayout>

第五步，MainActivity中的使用代碼

package com.test.ui.main;

import android.support.annotation.Nullable;
import android.view.View;
import android.widget.Button;

import com.test.R;
import com.test.base.BaseActivity;
import com.test.base.BasePresenter;
import com.test.util.LogUtil;

import butterknife.BindView;

/**
 * Created by Admin on 2017/5/19.
 */

public class MainActivity extends BaseActivity implements View.OnClickListener {

    @BindView(R.id.btn_test)
    Button mBtnTest;

    @BindView(R.id.cicle_view)
    CicleAddAndSubView mCicleView;

    @Override
    protected int getContentViewId() {
        return R.layout.activity_main;
    }

    @Override
    protected void initData() {

    }

    @Override
    protected void setListener() {
        mBtnTest.setOnClickListener(this);

        mCicleView.setOnNumChangeListener(new CicleAddAndSubView.OnNumChangeListener() {
            @Override
            public void onNumChange(View view, int type, int num) {
                switch(type){
                   case CicleAddAndSubView.TYPE_ADD:
                       LogUtil.e("=====add====="+num);
                       showShortToast("=====add====="+num);
                        break;
                   case CicleAddAndSubView.TYPE_SUBTRACT:
                       LogUtil.e("=====subtract====="+num);
                       showShortToast("=====subtract====="+num);
                        break;
                    case CicleAddAndSubView.TYPE_INPUT:
                        LogUtil.e("=====input====="+num);
                        showShortToast("=====input====="+num);
                        break;
                   default:
                        break;
                  }
            }
        });
    }

    @Nullable
    @Override
    protected BasePresenter getPresenter() {
        return null;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_test:
//                Intent serviceIntent=new Intent(mContext,DownLoadService.class);
//                serviceIntent.setAction("com.test.http.download.DownLoadService");
//                startService(serviceIntent);
                break;
            case 1:
                break;
            default:
                break;
        }
    }
}

最后，讓我們來看看效果圖吧

1.gif

ok，今天的內(nèi)容就講到這里了，謝謝誒。