Android EditText setTranslationY导致输入法覆盖问题

平台

RK3288 + Android 8.1
显示: 1920x1080 @ 160 dpi

概述

碰到一个问题：弹出的输入法会覆盖文本输入框。
原因：输入框使用了setTranslationY() 位置偏移后，输入法无法正确获取焦点的位置。

分析

先上图: 初始布局
在这里插入图片描述
调用etTranslationY(700);

弹出输入法

最后一张图中，输入框大概在红框的位置，也是本文所描述的问题： 输入法遮挡了输入框控件

布局


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

    <LinearLayout android:id="@+id/llEdit"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv"
            android:textSize="28sp"
            android:gravity="center"
            android:text="--------------FOOTER---------------------"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <EditText android:id="@+id/et"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="36sp"
            />
        <TextView
            android:id="@+id/tv2"
            android:textSize="28sp"
            android:gravity="center"
            android:text="--------------HEADER---------------------"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    LinearLayout>


    <Button android:id="@+id/btTy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="TranslationY"/>
RelativeLayout>
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java

package com.android.apitester.test;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import com.android.apitester.R;

public class EditTextTranslationTest extends Activity {
	EditText et;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.test_edittext_translation);

		et = (EditText) findViewById(R.id.et);
		findViewById(R.id.btTy).setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				et.setTranslationY(et.getTranslationY() != 0 ? 0 : 700);
			}
		});
	}
}

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稍微改下代码，把输入框放到界面底部
在这里插入图片描述

输入法正常弹出，并把整体UI往上顶。

后续做了一些数据， getTranslationY不同的大小以作比对

位移大小	展示效果	备注
-300	被覆盖	-
-70	被覆盖	-
-69	第一次后正常	第一次被覆盖
-50	第一次后正常	第一次被覆盖
>0	被覆盖	-

70 是控件的高度！

输入法是怎么把布局顶上去的? 答案在ViewRootImpl中。

frameworks/base/core/java/android/view/ViewRootImpl.java

    public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
        String innerPrefix = prefix + "  ";
        //..... 省略 .....
		writer.print(innerPrefix); 
		writer.print("getCurrY=");writer.print(mScroller != null ? mScroller.getCurrY():0);
		writer.print("mScrollY=");writer.print(mScrollY);
		writer.print("mCurScrollY=");writer.print(mCurScrollY);
	}
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dumpsys activity name

//未打开输入法
getCurrY=0,mScrollY=0,mCurScrollY=0

//打开输入法
getCurrY=372,mScrollY=372,mCurScrollY=372
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准确地说，是滚上去的

    boolean scrollToRectOrFocus(Rect rectangle, boolean immediate) {
        final Rect ci = getWindowInsets(false).getSystemWindowInsetsAsRect();
        final Rect vi = mAttachInfo.mVisibleInsets;
        int scrollY = 0;
        boolean handled = false;

        if (vi.left > ci.left || vi.top > ci.top
                || vi.right > ci.right || vi.bottom > ci.bottom) {
            // We'll assume that we aren't going to change the scroll
            // offset, since we want to avoid that unless it is actually
            // going to make the focus visible...  otherwise we scroll
            // all over the place.
            scrollY = mScrollY;
            // We can be called for two different situations: during a draw,
            // to update the scroll position if the focus has changed (in which
            // case 'rectangle' is null), or in response to a
            // requestChildRectangleOnScreen() call (in which case 'rectangle'
            // is non-null and we just want to scroll to whatever that
            // rectangle is).
            final View focus = mView.findFocus();
            if (focus == null) {
                return false;
            }
            View lastScrolledFocus = (mLastScrolledFocus != null) ? mLastScrolledFocus.get() : null;
            if (focus != lastScrolledFocus) {
                // If the focus has changed, then ignore any requests to scroll
                // to a rectangle; first we want to make sure the entire focus
                // view is visible.
                rectangle = null;
            }
            if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Eval scroll: focus=" + focus
                    + " rectangle=" + rectangle + " ci=" + ci
                    + " vi=" + vi);
            if (focus == lastScrolledFocus && !mScrollMayChange && rectangle == null) {
                // Optimization: if the focus hasn't changed since last
                // time, and no layout has happened, then just leave things
                // as they are.
                if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Keeping scroll y="
                        + mScrollY + " vi=" + vi.toShortString());
            } else {
                // We need to determine if the currently focused view is
                // within the visible part of the window and, if not, apply
                // a pan so it can be seen.
                mLastScrolledFocus = new WeakReference<View>(focus);
                mScrollMayChange = false;
                if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Need to scroll?");
                // Try to find the rectangle from the focus view.
                if (focus.getGlobalVisibleRect(mVisRect, null)) {
                    if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Root w="
                            + mView.getWidth() + " h=" + mView.getHeight()
                            + " ci=" + ci.toShortString()
                            + " vi=" + vi.toShortString());
                    if (rectangle == null) {
                        focus.getFocusedRect(mTempRect);
                        if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Focus " + focus
                                + ": focusRect=" + mTempRect.toShortString());
                        if (mView instanceof ViewGroup) {
                            ((ViewGroup) mView).offsetDescendantRectToMyCoords(
                                    focus, mTempRect);
                        }
                        if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                "Focus in window: focusRect="
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    } else {
                        mTempRect.set(rectangle);
                        if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                "Request scroll to rect: "
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    }
                    if (mTempRect.intersect(mVisRect)) {
                        if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                "Focus window visible rect: "
                                + mTempRect.toShortString());
                        if (mTempRect.height() >
                                (mView.getHeight()-vi.top-vi.bottom)) {
                            // If the focus simply is not going to fit, then
                            // best is probably just to leave things as-is.
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Too tall; leaving scrollY=" + scrollY);
                        }
                        // Next, check whether top or bottom is covered based on the non-scrolled
                        // position, and calculate new scrollY (or set it to 0).
                        // We can't keep using mScrollY here. For example mScrollY is non-zero
                        // due to IME, then IME goes away. The current value of mScrollY leaves top
                        // and bottom both visible, but we still need to scroll it back to 0.
                        else if (mTempRect.top < vi.top) {
                            scrollY = mTempRect.top - vi.top;
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Top covered; scrollY=" + scrollY);
                        } else if (mTempRect.bottom > (mView.getHeight()-vi.bottom)) {
                            scrollY = mTempRect.bottom - (mView.getHeight()-vi.bottom);
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Bottom covered; scrollY=" + scrollY);
                        } else {
                            scrollY = 0;
                        }
                        handled = true;
                    }
                }
            }
        }
        if (scrollY != mScrollY) {
            if (DEBUG_INPUT_RESIZE) Log.v(mTag, "Pan scroll changed: old="
                    + mScrollY + " , new=" + scrollY);
            if (!immediate) {
                if (mScroller == null) {
                    mScroller = new Scroller(mView.getContext());
                }
                mScroller.startScroll(0, mScrollY, 0, scrollY-mScrollY);
            } else if (mScroller != null) {
                mScroller.abortAnimation();
            }
            mScrollY = scrollY;
        }

        return handled;
    }        
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frameworks/base/core/java/android/view/View.java

    public void getDrawingRect(Rect outRect) {
        outRect.left = mScrollX;
        outRect.top = mScrollY;
        outRect.right = mScrollX + (mRight - mLeft);
        outRect.bottom = mScrollY + (mBottom - mTop);
    }

    public void getFocusedRect(Rect r) {
        getDrawingRect(r);
    }
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获取当前聚焦的控件的位置信息与当前ViewRootImpl的可见区域进行比对计算出滚动距离。
在绘制的过程中不断更新并计算滚动位置

通过修改mScroller的动画时长，可以清晰看到滚动的过程效果

mScroller.startScroll(0, mScrollY, 0, scrollY-mScrollY);
//改为
mScroller.startScroll(0, mScrollY, 0, scrollY-mScrollY, 1000);
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在这里插入图片描述
为什么刚好位移 setTranslationY(70) 无法滚动主窗口

		if (mTempRect.intersect(mVisRect)) {
                        if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                "Focus window visible rect: "
                                + mTempRect.toShortString());
                        if (mTempRect.height() >
                                (mView.getHeight()-vi.top-vi.bottom)) {
                            // If the focus simply is not going to fit, then
                            // best is probably just to leave things as-is.
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Too tall; leaving scrollY=" + scrollY);
                        }
                        // Next, check whether top or bottom is covered based on the non-scrolled
                        // position, and calculate new scrollY (or set it to 0).
                        // We can't keep using mScrollY here. For example mScrollY is non-zero
                        // due to IME, then IME goes away. The current value of mScrollY leaves top
                        // and bottom both visible, but we still need to scroll it back to 0.
                        else if (mTempRect.top < vi.top) {
                            scrollY = mTempRect.top - vi.top;
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Top covered; scrollY=" + scrollY);
                        } else if (mTempRect.bottom > (mView.getHeight()-vi.bottom)) {
                            scrollY = mTempRect.bottom - (mView.getHeight()-vi.bottom);
                            if (DEBUG_INPUT_RESIZE) Log.v(mTag,
                                    "Bottom covered; scrollY=" + scrollY);
                        } else {
                            scrollY = 0;
                        }
                        handled = true;
                    }
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获取的控件的焦点区域和可视区域不存在交集，导致后续的mScroller部分的代码没有执行。
在TextView中重写了 getFocusedRect，返回的是光标的坐标，在测试的DEMO中输出如下 [2,10][6,70] 的坐标。

/**
//弹
Need to scroll?
Root w=1920 h=1080 ci=[0,24][0,56] vi=[0,24][0,466]
Focus android.widget.EditText{4146188 VFED..CL. .F..H.I. 0,828-1920,898 #7f03000a app:id/et aid=1073741824}: focusRect=[2,10][6,70]
Focus in window: focusRect=[2,926][6,986] visRect=[0,916][1920,986]
Focus window visible rect: [2,926][6,986]
Bottom covered; scrollY=372
Pan scroll changed: old=0 , new=372

//不弹
Eval scroll: focus=android.widget.EditText{40fcecd VFED..CL. .F..H.I. 0,828-1920,898 #7f03000a app:id/et aid=1073741824} rectangle=null ci=Rect(0, 24 - 
Need to scroll?
Root w=1920 h=1080 ci=[0,24][0,56] vi=[0,24][0,466]
Focus android.widget.EditText{40fcecd VFED..CL. .F..H.I. 0,828-1920,898 #7f03000a app:id/et aid=1073741824}: focusRect=[2,10][6,70]
Focus in window: focusRect=[2,926][6,986] visRect=[0,846][1920,916]
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if (mTempRect.intersect(mVisRect)) 对应的两个矩形:

focusRect=[2,926][6,986] visRect=[0,916][1920,986] <- 弹
focusRect=[2,926][6,986] visRect=[0,846][1920,916] <- 不弹，无交集

参考

Android软键盘弹出时把布局顶上去的解决方法
 Android EditText默认不弹出输入法的实现方法
 5种方法完美解决android软键盘挡住输入框方法详解
 Android输入法弹出流程

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原文地址：https://blog.csdn.net/ansondroider/article/details/132732616