Android软键盘-弹起时布局向上拉-登录界面
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:
- Android软键盘-弹起时布局向上拉-多表单填写界面
- Android软键盘-弹起时布局向上拉-登录界面
- Android软键盘-显示隐藏软键盘
demo in github
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:
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:
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
...........
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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