中级控件——文本输入——文本变化监听器

灰太狼 2023-09-28 14:30 2阅读 0赞

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<?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_focused="true" android:drawable="@drawable/shape_edit_focus"/>
        <item android:drawable="@drawable/shape_edit_normal"/>
    </selector>

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<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android" >
    
        
        <solid android:color="#ffffff" />
    
        
        <stroke
            android:width="1dp"
            android:color="#aaaaaa" />
    
        
        <corners android:radius="5dp" />
    
        
        <padding
            android:bottom="2dp"
            android:left="2dp"
            android:right="2dp"
            android:top="2dp" />
    
    </shape>

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<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android" >
    
        
        <solid android:color="#ffffff" />
    
        
        <stroke
            android:width="1dp"
            android:color="#0000ff" />
    
        
        <corners android:radius="5dp" />
    
        
        <padding
            android:bottom="2dp"
            android:left="2dp"
            android:right="2dp"
            android:top="2dp" />
    
    </shape>

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package com.example.myapplication;
    
    import android.app.Activity;
    import android.content.Context;
    import android.view.View;
    import android.view.inputmethod.InputMethodManager;
    
    public class ViewUtil {
    
        public static void hideAllInputMethod(Activity act)
        {
            // 从系统服务中获取输入法管理器
            InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
            
            if (imm.isActive())           // 软键盘如果已经打开则关闭之
            { 
                imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
            }
        }
    
        public static void hideOneInputMethod(Activity act, View v)
        {
            // 从系统服务中获取输入法管理器
            InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
            
            // 关闭屏幕上的输入法软键盘
            imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
        }
    
    }

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package com.example.myapplication;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.text.Editable;
    import android.text.TextUtils;
    import android.text.TextWatcher;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.Toast;
    
    
    public class MainActivity extends AppCompatActivity
    {
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            // 从布局文件中获取名叫et_phone的手机号码编辑框
            EditText et_phone = findViewById(R.id.et_phone);
    
            // 从布局文件中获取名叫et_password的密码编辑框
            EditText et_password = findViewById(R.id.et_password);
    
            // 给手机号码编辑框添加文本变化监听器
            et_phone.addTextChangedListener(new HideTextWatcher(et_phone, 11));
    
            // 给密码编辑框添加文本变化监听器
            et_password.addTextChangedListener(new HideTextWatcher(et_password, 6));
        }
    
        // 定义一个编辑框监听器，在输入文本达到指定长度时自动隐藏输入法
        private class HideTextWatcher implements TextWatcher
        {
            private EditText mView; // 声明一个编辑框对象
            private int mMaxLength; // 声明一个最大长度变量
    
            public HideTextWatcher(EditText v, int maxLength)
            {
                super();
                mView = v;
                mMaxLength = maxLength;
            }
    
            // 在编辑框的输入文本变化前触发
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
    
            // 在编辑框的输入文本变化时触发
            public void onTextChanged(CharSequence s, int start, int before, int count) {}
    
            // 在编辑框的输入文本变化后触发
            public void afterTextChanged(Editable s)
            {
                String str = s.toString(); // 获得已输入的文本字符串
    
                // 输入文本达到11位(如手机号码)，或者达到6位(如登录密码)时关闭输入法
                if ((str.length() == 11 && mMaxLength == 11) || (str.length() == 6 && mMaxLength == 6))
                {
                    ViewUtil.hideOneInputMethod(MainActivity.this, mView); // 隐藏输入法软键盘
                }
            }
        }
    }

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