如何编程隐藏安卓软键盘

原文:https://www . geeksforgeeks . org/如何编程-隐藏-安卓-软键盘/

在本文中，我们将学习如何以编程方式隐藏软键盘。键盘通常会隐藏，但在某些情况下它不会隐藏。所以为了更好的用户体验，键盘是以编程方式隐藏的。

不使用下图方法，app 默认响应如下:-

[https://media.geeksforgeeks.org/wp-content/uploads/20200513200946/Record_2020-05-13-20-08-52_750d96ee45c2372059ea1c16be9c6b891.mp4](https://media.geeksforgeeks.org/wp-content/uploads/20200513200946/Record_2020-05-13-20-08-52_750d96ee45c2372059ea1c16be9c6b891.mp4)

进场:

  1. 现在在 activity_main.xml 文件中添加以下代码。下面的代码在 activity_main 中添加了一个文本视图、编辑文本和一个按钮。点击该按钮将调用 MainActivity 类中的 setText 功能。

    activity _ main . XML

    ```java <?xml version="1.0" encoding="utf-8"?>

    <TextView         android:textStyle="bold"         android:textColor="#219806"         android:id="@+id/text_view_result"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal"         android:text="GeeksForGeeks"         android:textSize="22sp" />

    <EditText         android:layout_marginTop="20dp"         android:id="@+id/edit_text_input"         android:layout_width="match_parent"         android:layout_height="wrap_content" />

    ```

  2. 现在在MainActivity.java文件中添加以下代码。这里我们定义设置文本和关闭键盘功能。当用户点击按钮时，setText 函数被调用。它从 edittext 获取输入，并在 textview 中替换它。然后它调用 closeKeyboard 函数并清除 edittext 的值。closeKeyboard 功能隐藏键盘。

    MainActivity.java

    ```java package org.geeksforgeeks.gfgHideKey

    import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.inputmethod     .InputMethodManager; import android.widget.EditText; import android.widget.TextView;

    public class MainActivity     extends AppCompatActivity {     private TextView textViewResult;     private EditText editTextInput;

    @Override     protected void onCreate(         Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);

    textViewResult             = findViewById(                 R.id.text_view_result);         editTextInput             = findViewById(                 R.id.edit_text_input);     }

    public void setText(View v)     {         String newText             = editTextInput                   .getText()                   .toString();         textViewResult.setText(newText);

    closeKeyboard();         editTextInput.setText("");     }

    private void closeKeyboard()     {         // this will give us the view         // which is currently focus         // in this layout         View view = this.getCurrentFocus();

    // if nothing is currently         // focus then this will protect         // the app from crash         if (view != null) {

    // now assign the system             // service to InputMethodManager             InputMethodManager manager                 = (InputMethodManager)                     getSystemService(                         Context.INPUT_METHOD_SERVICE);             manager                 .hideSoftInputFromWindow(                     view.getWindowToken(), 0);         }     } } ```

输出:

[https://media.geeksforgeeks.org/wp-content/uploads/20200505213321/Record_2020-05-05-21-26-14_750d96ee45c2372059ea1c16be9c6b891.mp4](https://media.geeksforgeeks.org/wp-content/uploads/20200505213321/Record_2020-05-05-21-26-14_750d96ee45c2372059ea1c16be9c6b891.mp4)

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