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:
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:
<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)。