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Android软键盘-弹起时布局向上拉-登录界面

Android软键盘-弹起时布局向上拉-登录界面

作者: Matt_Kill | 来源:发表于2018-06-12 17:27 被阅读583次

    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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        本文标题:Android软键盘-弹起时布局向上拉-登录界面

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