Android 键盘事件触发以及监听

一、Android 手动显示和隐藏软键盘

• 如果输入法在窗口上已经显示，则隐藏，反之则显示

InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);  
imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS); 

• view为接受软键盘输入的视图，SHOW_FORCED表示强制显示

InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);  
imm.showSoftInput(view,InputMethodManager.SHOW_FORCED);  

imm.hideSoftInputFromWindow(view.getWindowToken(), 0); //强制隐藏键盘 

• 调用隐藏系统默认的输入法

// (WidgetSearchActivity是当前的Activity)  
((InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(WidgetSearchActivity.this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); 

• 获取输入法打开的状态

InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);  
boolean isOpen=imm.isActive();//isOpen若返回true，则表示输入法打开 

二、Android 键盘弹起和回落事件监听

AndroidMainfest.xml

 <activity
            android:name=".MainActivity"
            android:windowSoftInputMode="stateAlwaysHidden|adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
 </activity>

MainActivity

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

/**
 * 捕捉界面键盘弹起动作
 * 例如 京东金融 登陆界面 在输入框获取焦点后键盘弹出把整个布局上移
 * 键盘回落后布局也相应回落
 *
 */
public class MainActivity extends AppCompatActivity {

    private LinearLayout root_view;

    private int screenHeight = 0;
    private int keyHeight = 0;

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

    private void initView() {
        root_view = (LinearLayout) findViewById(R.id.root_view);
    }

    private void initListener() {
        root_view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                if (oldBottom != 0 && bottom != 0 && (oldBottom - bottom > keyHeight)) {
                    Toast.makeText(MainActivity.this,"键盘弹起",Toast.LENGTH_SHORT).show();
                } else if (oldBottom != 0 && bottom != 0 && (bottom - oldBottom > keyHeight)) {
                    Toast.makeText(MainActivity.this,"键盘落下",Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void initOtherData() {
        screenHeight = this.getWindowManager().getDefaultDisplay().getHeight();
        keyHeight = screenHeight / 3;
    }

}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context="open.ppdai.com.keyboardlogin.MainActivity">


  <!--你的布局，注意，上面代码部分用到了跟布局id-->


</LinearLayout>

你也可以看这里
和这里