弹出软键盘

前提：必须要有一个可以编辑的控件（EditText），并且当前已经获取焦点

/**
 * 弹出软键盘
 */
public void openKeyboard(View view) {
    // 获取焦点
    editText2.setFocusable(true);
    editText2.setFocusableInTouchMode(true);
    editText2.requestFocus();
    // 弹出软键盘
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.showSoftInput(editText2, 0);
}

参数说明

/**
 * Synonym for {@link #showSoftInput(View, int, ResultReceiver)} without a result receiver: explicitly request that the current input method's soft input area be shown to the user, if needed.
 * 
 * @param view The currently focused view, which would like to receive soft keyboard input.
 * @param flags Provides additional operating flags.  Currently may be 0 or have the {@link #SHOW_IMPLICIT} bit set.
 */
public boolean showSoftInput(View view, int flags) {
    return showSoftInput(view, flags, null);
}

• 效果图

隐藏软键盘

/**
 * 关闭软键盘
 */
public void closeKeyboard(View view) {
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}

hideSoftInputFromWindow()方法的参数是一个IBinder窗口令牌，可以用View.getWindowToken()从附加到窗口的View对象上获得，大部分情况下，每个事件的回调方法都会有一个引用指向正在编辑的TextView，或者是发起事件的View（比如某个按钮），通过调用这些对象获得窗口令牌，再将其传递给InputMethodManager最方便的做法。

• 效果图

软键盘开关

开启软键盘的时候隐藏软键盘，隐藏软键盘的时候开启软键盘

/**
 * 软键盘开关
 */
public void toggleKeyboard(View view) {
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.toggleSoftInputFromWindow(view.getWindowToken(), 0, 0);
}

弹出键盘的时候是一个道理，想要编辑哪个EditText，要先让其获取焦点

• 效果图

测试类

package com.kongqw.kqwkeysetdemo;

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


public class MainActivity extends Activity {

    private EditText editText;
    private EditText editText2;

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

        editText = (EditText) findViewById(R.id.edittext);
        editText2 = (EditText) findViewById(R.id.edittext2);
    }

    /**
     * 弹出软键盘
     */
    public void openKeyboard(View view) {
        // 获取焦点
        editText2.setFocusable(true);
        editText2.setFocusableInTouchMode(true);
        editText2.requestFocus();
        // 弹出软键盘
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(editText2, 0);
    }

    /**
     * 关闭软键盘
     */
    public void closeKeyboard(View view) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }

    /**
     * 软键盘开关
     */
    public void toggleKeyboard(View view) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.toggleSoftInputFromWindow(view.getWindowToken(), 0, 0);
    }
}

页面布局

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/edittext2"
        android:layout_width="match_parent"
        android:layout_below="@+id/edittext"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edittext2"
        android:onClick="openKeyboard"
        android:text="弹出软键盘" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:onClick="closeKeyboard"
        android:text="关闭软键盘" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button2"
        android:onClick="toggleKeyboard"
        android:text="开关" />
</RelativeLayout>