仿QQ微信点击EditText布局随软键盘的弹出顶上去

主要原理：监听软键盘的弹出，调用ScrollView的
fullScroll(ScrollView.FOCUS_DOWN);或者是scrollTo(0, 1000)的方法

已如下xml布局为例：

总得来说就是将需要向上顶的布局写在ScrollView中。理解后可略过。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rl_contain"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentBottom="true"
    android:fitsSystemWindows="true">

<include
    android:id="@+id/title"
    layout="@layout/include_login_header" />

<ScrollView
    android:id="@+id/sv_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/title">


    <RelativeLayout
        android:id="@+id/rl_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:orientation="vertical">


        <ImageView
            android:id="@+id/iv_login_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="40dp"
            android:src="@mipmap/logo_login" />

        <EditText
            android:id="@+id/et_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/iv_login_logo"
            android:layout_marginLeft="38dp"
            android:layout_marginRight="38dp"
            android:layout_marginTop="58dp"
            android:background="@null"
            android:hint="@string/login_username"
            android:inputType="phone"
            android:paddingBottom="12dp"
            android:singleLine="true"
            android:textColorHint="@color/search_edittext_hint"
            android:textSize="@dimen/font_size_14" />

        <View
            android:id="@+id/v_line1"
            style="@style/horizontal_line_gray"
            android:layout_below="@+id/et_username"
            android:layout_marginLeft="38dp"
            android:layout_marginRight="38dp" />

        <EditText
            android:id="@+id/et_passwork"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/v_line1"
            android:layout_marginLeft="38dp"
            android:layout_marginRight="38dp"
            android:layout_marginTop="16dp"
            android:background="@null"
            android:hint="@string/login_password"
            android:inputType="textPassword"
            android:paddingBottom="12dp"
            android:singleLine="true"
            android:textColorHint="@color/search_edittext_hint"
            android:textSize="@dimen/font_size_14" />

        <View
            android:id="@+id/v_line2"
            style="@style/horizontal_line_gray"
            android:layout_below="@+id/et_passwork"
            android:layout_marginLeft="38dp"
            android:layout_marginRight="38dp" />

        <RelativeLayout
            android:id="@+id/rl_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/v_line2">

            <TextView
                android:id="@+id/tv_register"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="30dp"
                android:padding="8dp"
                android:text="@string/login_register"
                android:textColor="@color/search_edittext_hint" />

            <TextView
                android:id="@+id/tv_login_forget"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_marginRight="30dp"
                android:padding="8dp"
                android:text="@string/login_forget"
                android:textColor="@color/search_edittext_hint" />
        </RelativeLayout>

        <Button
            android:id="@+id/btn_login"
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:layout_alignParentBottom="true"
            android:layout_below="@+id/rl_1"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="38dp"
            android:layout_marginRight="38dp"
            android:layout_marginTop="22dp"
            android:background="@drawable/btn_normal_bg"
            android:gravity="center"
            android:text="@string/login_btn"
            android:textColor="@color/white"
            android:textSize="@dimen/font_size_15" />

    </RelativeLayout>

</ScrollView>

</RelativeLayout>

首先提供一个软键盘监听的工具类

package com.xinsundoc.doctor.utils;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;
import android.widget.ScrollView;


/**
 * 类名称：KeyboardUtil<br>
 * 内容摘要： 监听软键盘显示与隐藏
 */
public class KeyboardUtil {
    private static final String TAG = "KeyboardUtil";

    public static KeyboardUtil assistActivity(Activity activity, int viewId) {
        return new KeyboardUtil(activity, viewId);
    }

    private View mChildOfContent;
    private ScrollView mScrollView; //从activity传进来的ScrollView

    private KeyboardUtil(Activity activity, int viewId) {
        FrameLayout content = (FrameLayout) activity
                .findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mScrollView = (ScrollView) content.findViewById(viewId); //从activity       传进来的ScrollView
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(
            new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    possiblyResizeChildOfContent();
                }
            });
}

    private void possiblyResizeChildOfContent() {
        int contentHeight = mChildOfContent.getRootView().getHeight();
        int curDisplayHeight = computeUsableHeight();
        if (contentHeight - curDisplayHeight > contentHeight / 4) { //软键盘弹出
            Log.e(TAG, "possiblyResizeChildOfContent: 软键盘弹出" );
//                mScrollView.fullScroll(ScrollView.FOCUS_DOWN);
    //将ScrollView滑动到底部
    //这里不开线程的话，会出现点击第二个输入框不顶上去的bug，
    //初步估计是mScrollView.scrollTo(0, 1000);的原因(最好使用handler)
           new Thread(){
                @Override
                public void run() {
                    mScrollView.scrollBy(0, 1000);
                }
            }.start();
            if(mKeyBoardOpenListener != null){
                mKeyBoardOpenListener.open();
            }
        } else {  //软键盘关闭
            if(mKeyBoardOpenListener != null){
                mKeyBoardOpenListener.close();
            }
            Log.e(TAG, "possiblyResizeChildOfContent: 软键盘关闭" );
        }
}

    /**
     * 获取屏幕可显示区域高度
     *
     * @return
     */
    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
       return r.height();
    }

    private KeyBoardOpenListener mKeyBoardOpenListener;
     /**
     * 给其他类提供软键盘弹起关闭的监听
     *
     */
    public interface KeyBoardOpenListener{
        void open();
        void close();
    }
    public void setOnKeyBoardOpenListener(KeyBoardOpenListener mKeyBoardOpenListener){
        this.mKeyBoardOpenListener = mKeyBoardOpenListener;
    }
}

方法一：使用fullScroll(ScrollView.FOCUS_DOWN)：

使用者中方法有一个问题：
如果一个ScrollView中有多个EditText，不管你点击哪个EditText调起软键盘，调用fullScroll(ScrollView.FOCUS_DOWN)方法后都会将焦点给最底部的那个EditText。
解决方法:
1.通过EditText的setOnTouchListener()方法获取首次点击的是哪个EditText();
2.在软键盘的监听方法open()中调用editText.requestFocus();

public class LoginActivity extends AppCompatActivity {
private static final String TAG = "LoginActivity";
@BindView(R.id.et_passwork)
EditText password;
@BindView(R.id.et_username)
EditText mobile;
@BindView(R.id.tv_main_title)

private EditText mEdittext;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login2);
    ButterKnife.bind(this);

    inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    KeyboardUtil keyboardUtil = KeyboardUtil.assistActivity(this, R.id.sv_content);
    keyboardUtil.setOnKeyBoardOpenListener(new KeyboardUtil.KeyBoardOpenListener() {
        @Override
        public void open() {
            if(mEdittext != null){
                mEdittext.requestFocus(); //请求获取焦点
            }
        }

        @Override
        public void close() {

        }
    });

    mobile.setOnTouchListener(new MyOnTouchListener());
    password.setOnTouchListener(new MyOnTouchListener());
}

/**
 * Edittext的监听事件
 */
class MyOnTouchListener implements View.OnTouchListener {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (v.getId()){
            case R.id.et_username:
                mEdittext = mobile;
                Log.e(TAG, "onTouch: mobile点击了");
                break;
            case R.id.et_passwork:
                mEdittext = password;
                Log.e(TAG, "onTouch: password点击了");
                break;
        }
        return false;
    }
}
}

方法二：使用scrollTo(0, 100)开新线程：

在软键盘弹起方法中调用

//这里不开新线程的话，会出现点击第二个输入框不顶上去的bug，
//初步估计是mScrollView.scrollTo(0, 1000);的原因 最好使用handler开新线程
   new Thread(){
                @Override
                public void run() {
                    mScrollView.scrollBy(0, 1000);
                }
            }.start();