Android开发经验总结、系列讲解优秀案例

Android软键盘-弹起时布局向上拉-登录界面

2018-06-12  本文已影响583人  Matt_Kill

本文参照Android 模仿QQ登录界面解决软键盘遮挡问题进行整理修正
Android软键盘系列:

场景:登录界面,当Edittext聚集时,软键盘弹出, 软键盘会遮住登录按钮:
实现前:

image.png

实现后:


image.png

在我另外一篇关于Android软键盘的文章中,我们提到使用windowsoftinputmode属性可以解决部分软键盘遮住控件的问题,如果对windowsoftinputmode属性还不了解,请先跳转到 Android软键盘-弹起时布局向上拉-多表单填写界面 了解清楚。
在这个场景中,单纯使用windowsoftinputmode明显无法解决问题。

Step1

设置windowsoftinputmode=adjustResize;
可以在清单文件在设置,也可以在代码中设置,此处不再详述。

Step2

监听Activity中contentview(android.R.id.content)的宽高变化,相当于监听软键盘是弹起还是收起。
使用到的事件是:

 View content = activity.findViewById(android.R.id.content);
 content.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);

Step3

计算出弹出的软键盘顶部距屏幕底部的高度,和登录按钮底部距屏幕底部的高度,两者相减得出一个高度差offset。当小键盘弹出时,使登录按钮,Edittext和图片控件的共同的父控件向上上移offset就可以。
监听软键盘代码被封装成一个类,可以适用相似的情况:


import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Rect;
import android.util.Log;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.WindowManager;

/**
 * Created by matth on 2018/6/12.
 */

public class KeyBoardHelper {
    private Activity activity;
    private OnKeyBoardStatusChangeListener onKeyBoardStatusChangeListener;
    private int screenHeight;
    // 空白高度 = 屏幕高度 - 当前 Activity 的可见区域的高度
    // 当 blankHeight 不为 0 即为软键盘高度。
    private int blankHeight = 0;

    public KeyBoardHelper(Activity activity) {
        this.activity = activity;
        screenHeight = activity.getResources().getDisplayMetrics().heightPixels;
        activity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        if (activity.getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
            activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
    }

    public void onCreate() {
        View content = activity.findViewById(android.R.id.content);
        content.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);
    }

    public void onDestory() {
        View content = activity.findViewById(android.R.id.content);
        content.getViewTreeObserver().removeOnGlobalLayoutListener(onGlobalLayoutListener);
    }

    private ViewTreeObserver.OnGlobalLayoutListener onGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            Rect rect = new Rect();
            activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
            int newBlankheight = screenHeight - rect.bottom;

            if (newBlankheight != blankHeight) {
                if(newBlankheight==0){
                    // keyboard close
                    if (onKeyBoardStatusChangeListener != null) {
                        onKeyBoardStatusChangeListener.OnKeyBoardClose(blankHeight);
                    }
                }else{
                    // keyboard pop
                    if (onKeyBoardStatusChangeListener != null) {
                        onKeyBoardStatusChangeListener.OnKeyBoardPop(newBlankheight);
                    }
                }
            }
            blankHeight = newBlankheight;
        }
    };

    public void setOnKeyBoardStatusChangeListener(
            OnKeyBoardStatusChangeListener onKeyBoardStatusChangeListener) {
        this.onKeyBoardStatusChangeListener = onKeyBoardStatusChangeListener;
    }

    public interface OnKeyBoardStatusChangeListener {

        void OnKeyBoardPop(int keyBoardheight);

        void OnKeyBoardClose(int oldKeyBoardheight);
    }
}

布局代码如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/layout_root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/layout_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="68dp"
            android:focusable="true"
            android:scaleType="centerInside"
            android:src="@drawable/qq1"
            android:visibility="visible" />

        <LinearLayout
            android:id="@+id/layout_ed"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="18dp"
            android:background="#ffffff"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:orientation="vertical" >

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@null"
                android:hint="QQ号/手机号/邮箱"
                android:padding="10dp"
                android:textColor="#000000"
                android:textColorHint="#d2d2d2"
                android:textCursorDrawable="@null" />

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@null"
                android:hint="密码"
                android:password="true"
                android:padding="10dp"
                android:textColor="#000000"
                android:textColorHint="#d2d2d2"
                android:textCursorDrawable="@null" />
        </LinearLayout>

        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="14dp"
            android:layout_marginRight="14dp"
            android:layout_marginTop="14dp"
            android:text="登陆"
            android:textSize="17sp" />

        <RelativeLayout
            android:id="@+id/layout_bottom"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >

            <TextView
                android:id="@+id/tv_cannot_login"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_margin="14dp"
                android:text="无法登陆?"
                android:textSize="14sp" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_alignParentRight="true"
                android:layout_margin="14dp"
                android:text="新用户"
                android:textSize="14sp" />
        </RelativeLayout>
    </LinearLayout>



</RelativeLayout>

Activity代码:

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by matth on 2018/6/12.
 */

public class LoginActivity1 extends AppCompatActivity {

    private int screenHeight;
    private View layout_content;
    private View layout_bottom;
    private int bottomHeight;
    private KeyBoardHelper boardHelper;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login1);
        layout_content = findViewById(R.id.layout_content);
        layout_bottom = findViewById(R.id.layout_bottom);
        boardHelper = new KeyBoardHelper(this);
        boardHelper.onCreate();
        boardHelper.setOnKeyBoardStatusChangeListener(onKeyBoardStatusChangeListener);
        layout_bottom.post(new Runnable() {
            @Override
            public void run() {
                bottomHeight = layout_bottom.getHeight();
                Log.i("vlog","=================bottomHeight:"+bottomHeight);
            }
        });
    }
    private KeyBoardHelper.OnKeyBoardStatusChangeListener onKeyBoardStatusChangeListener = new KeyBoardHelper.OnKeyBoardStatusChangeListener() {
        @Override
        public void OnKeyBoardPop(int keyBoardheight) {
            final int height = keyBoardheight;
            if (bottomHeight > height) {
                layout_bottom.setVisibility(View.GONE);
            } else {
                int offset = bottomHeight - height;
                final ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) layout_content
                        .getLayoutParams();
                //当offset为负数时,layout_content向上移
                lp.topMargin = offset;
                layout_content.setLayoutParams(lp);
            }
        }
        @Override
        public void OnKeyBoardClose(int oldKeyBoardheight) {
            if (View.VISIBLE != layout_bottom.getVisibility()) {
                layout_bottom.setVisibility(View.VISIBLE);
            }
            final ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) layout_content
                    .getLayoutParams();
            if (lp.topMargin != 0) {
                lp.topMargin = 0;
                layout_content.setLayoutParams(lp);
            }
        }
    };
    @Override
    protected void onDestroy() {
        super.onDestroy();
        boardHelper.onDestory();
    }
}

坑1

原文Android 模仿QQ登录界面解决软键盘遮挡问题中的KeyBoardHelper类存在一个bug:两个Edittext的inputtype都是text,如果将其中一个改成password,程序就会出现bug.
本文代码已经修正了这个bug,具体如何修正,不详述。

坑2

本demo中Edittext, login button, Imageview的父控件的Id为layout_content

    <LinearLayout
        android:id="@+id/layout_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
        ...........
        </LinearLayout>

不可以给layout_content设置 android:layout_centerInParent="true" 之类的属性。
因为demo中是通过设置ayout_content的marginTop值来实现使ayout_content上移的效果的(
当marginTop的值为负数时,控件上移)。

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