Android 如何将视图与TextView内的文本垂直对齐?
我正在努力实现这个结果: 我现在拥有的是Android 如何将视图与TextView内的文本垂直对齐?,android,textview,imageview,android-constraintlayout,autoresize,Android,Textview,Imageview,Android Constraintlayout,Autoresize,我正在努力实现这个结果: 我现在拥有的是ConstraintLayout,它包括三个视图:文本视图,图像视图,图像视图 设计要求: 文本居中于TextView TextView具有固定大小的80dp 文本大小应为自动调整大小 图像视图应根据文本在文本视图中的位置水平变化。请参见案例#1/#2中的图像以供参考 是否可以用XML实现第4项?如何通过编程实现 [其他信息] 自动调整大小在宽度包裹内容时无法正常工作,请参阅: 注意:如果在XML文件中设置了自动调整大小,则不建议对XML文件的layou
ConstraintLayout
,它包括三个视图
:文本视图
,图像视图
,图像视图
设计要求:
TextView
李>
TextView
具有固定大小的80dp图像视图
应根据文本在文本视图
中的位置水平变化。请参见案例#1/#2中的图像以供参考包裹内容时无法正常工作,请参阅:
注意:如果在XML文件中设置了自动调整大小,则不建议对XML文件的layout\u width
或layout\u height
属性使用值“wrap\u content”。它可能会产生意想不到的结果
因此,经过调查,我们找到了两种解决方案:
- 计算文本宽度并将水平偏差应用于
ImageView
s李>
- 自定义文本视图-
自动ResizeTextView
李>
在第一种情况下,我们在文本视图中获得文本的实际宽度
:
Rect bounds = new Rect();
textView.getPaint().getTextBounds(textView.getText().toString(), 0, textView.getText().length(), bounds);
float width = bounds.width();
然后应用简单的数学计算图像视图
s的水平偏差
第二个选项是添加自定义视图。它不同于。在onLayout
中测量后,它将调整文本大小。在onTextChanged
中,我们重置文本大小而不调整大小。省略它是一个附加功能,在某些情况下可能有用
/**
* Text view that auto adjusts text size to fit within the view.
* If the text size equals the minimum text size and still does not
* fit, append with an ellipsis.
*/
public class AutoResizeTextView extends android.support.v7.widget.AppCompatTextView {
// Minimum text size for this text view
public static final float MIN_TEXT_SIZE = 20;
// Interface for resize notifications
public interface OnTextResizeListener {
public void onTextResize(TextView textView, float oldSize, float newSize);
}
// Our ellipse string
private static final String mEllipsis = "...";
// Registered resize listener
private OnTextResizeListener mTextResizeListener;
// Flag for text and/or size changes to force a resize
private boolean mNeedsResize = false;
// Text size that is set from code. This acts as a starting point for resizing
private float mTextSize;
// Temporary upper bounds on the starting text size
private float mMaxTextSize = 0;
// Lower bounds for text size
private float mMinTextSize = MIN_TEXT_SIZE;
// Text view line spacing multiplier
private float mSpacingMult = 1.0f;
// Text view additional line spacing
private float mSpacingAdd = 0.0f;
// Add ellipsis to text that overflows at the smallest text size
private boolean mAddEllipsis = true;
// Default constructor override
public AutoResizeTextView(Context context) {
this(context, null);
}
// Default constructor when inflating from XML file
public AutoResizeTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
// Default constructor override
public AutoResizeTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mTextSize = getTextSize();
}
/**
* When text changes, set the force resize flag to true and reset the text size.
*/
@Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
mNeedsResize = true;
// Since this view may be reused, it is good to reset the text size
resetTextSize();
}
/**
* If the text view size changed, set the force resize flag to true
*/
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh) {
mNeedsResize = true;
}
}
/**
* Register listener to receive resize notifications
*
* @param listener
*/
public void setOnResizeListener(AutoResizeTextView.OnTextResizeListener listener) {
mTextResizeListener = listener;
}
/**
* Override the set text size to update our internal reference values
*/
@Override
public void setTextSize(float size) {
super.setTextSize(size);
mTextSize = getTextSize();
}
/**
* Override the set text size to update our internal reference values
*/
@Override
public void setTextSize(int unit, float size) {
super.setTextSize(unit, size);
mTextSize = getTextSize();
}
/**
* Override the set line spacing to update our internal reference values
*/
@Override
public void setLineSpacing(float add, float mult) {
super.setLineSpacing(add, mult);
mSpacingMult = mult;
mSpacingAdd = add;
}
/**
* Set the upper text size limit and invalidate the view
*
* @param maxTextSize
*/
public void setMaxTextSize(float maxTextSize) {
mMaxTextSize = maxTextSize;
requestLayout();
invalidate();
}
/**
* Return upper text size limit
*
* @return
*/
public float getMaxTextSize() {
return mMaxTextSize;
}
/**
* Set the lower text size limit and invalidate the view
*
* @param minTextSize
*/
public void setMinTextSize(float minTextSize) {
mMinTextSize = minTextSize;
requestLayout();
invalidate();
}
/**
* Return lower text size limit
*
* @return
*/
public float getMinTextSize() {
return mMinTextSize;
}
/**
* Set flag to add ellipsis to text that overflows at the smallest text size
*
* @param addEllipsis
*/
public void setAddEllipsis(boolean addEllipsis) {
mAddEllipsis = addEllipsis;
}
/**
* Return flag to add ellipsis to text that overflows at the smallest text size
*
* @return
*/
public boolean getAddEllipsis() {
return mAddEllipsis;
}
/**
* Reset the text to the original size
*/
public void resetTextSize() {
if (mTextSize > 0) {
super.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
mMaxTextSize = mTextSize;
}
}
/**
* Resize text after measuring
*/
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (changed || mNeedsResize) {
int widthLimit = (right - left) - getCompoundPaddingLeft() - getCompoundPaddingRight();
int heightLimit = (bottom - top) - getCompoundPaddingBottom() - getCompoundPaddingTop();
resizeText(widthLimit, heightLimit);
}
super.onLayout(changed, left, top, right, bottom);
}
/**
* Resize the text size with default width and height
*/
public void resizeText() {
int heightLimit = getHeight() - getPaddingBottom() - getPaddingTop();
int widthLimit = getWidth() - getPaddingLeft() - getPaddingRight();
resizeText(widthLimit, heightLimit);
}
/**
* Resize the text size with specified width and height
*
* @param width
* @param height
*/
public void resizeText(int width, int height) {
CharSequence text = getText();
// Do not resize if the view does not have dimensions or there is no text
if (text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
return;
}
if (getTransformationMethod() != null) {
text = getTransformationMethod().getTransformation(text, this);
}
// Get the text view's paint object
TextPaint textPaint = getPaint();
// Store the current text size
float oldTextSize = textPaint.getTextSize();
// If there is a max text size set, use the lesser of that and the default text size
float targetTextSize = mMaxTextSize > 0 ? Math.min(mTextSize, mMaxTextSize) : mTextSize;
// Get the required text height
int textHeight = getTextHeight(text, textPaint, width, targetTextSize);
// Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
while (textHeight > height && targetTextSize > mMinTextSize) {
targetTextSize = Math.max(targetTextSize - 2, mMinTextSize);
textHeight = getTextHeight(text, textPaint, width, targetTextSize);
}
// If we had reached our minimum text size and still don't fit, append an ellipsis
if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height) {
// Draw using a static layout
// modified: use a copy of TextPaint for measuring
TextPaint paint = new TextPaint(textPaint);
// Draw using a static layout
StaticLayout layout = new StaticLayout(text, paint, width, Layout.Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
// Check that we have a least one line of rendered text
if (layout.getLineCount() > 0) {
// Since the line at the specific vertical position would be cut off,
// we must trim up to the previous line
int lastLine = layout.getLineForVertical(height) - 1;
// If the text would not even fit on a single line, clear it
if (lastLine < 0) {
setText("");
}
// Otherwise, trim to the previous line and add an ellipsis
else {
int start = layout.getLineStart(lastLine);
int end = layout.getLineEnd(lastLine);
float lineWidth = layout.getLineWidth(lastLine);
float ellipseWidth = textPaint.measureText(mEllipsis);
// Trim characters off until we have enough room to draw the ellipsis
while (width < lineWidth + ellipseWidth) {
lineWidth = textPaint.measureText(text.subSequence(start, --end + 1).toString());
}
setText(text.subSequence(0, end) + mEllipsis);
}
}
}
// Some devices try to auto adjust line spacing, so force default line spacing
// and invalidate the layout as a side effect
setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
setLineSpacing(mSpacingAdd, mSpacingMult);
// Notify the listener if registered
if (mTextResizeListener != null) {
mTextResizeListener.onTextResize(this, oldTextSize, targetTextSize);
}
// Reset force resize flag
mNeedsResize = false;
}
// Set the text size of the text paint object and use a static layout to render text off screen before measuring
private int getTextHeight(CharSequence source, TextPaint paint, int width, float textSize) {
// modified: make a copy of the original TextPaint object for measuring
// (apparently the object gets modified while measuring, see also the
// docs for TextView.getPaint() (which states to access it read-only)
TextPaint paintCopy = new TextPaint(paint);
// Update the text paint object
paintCopy.setTextSize(textSize);
// Measure using a static layout
StaticLayout layout = new StaticLayout(source, paintCopy, width, Layout.Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
return layout.getHeight();
}
}
/**
*自动调整文本大小以适应视图的文本视图。
*如果文本大小等于最小文本大小,但仍然不等于
*fit,用省略号追加。
*/
公共类AutoResizeTextView扩展了android.support.v7.widget.AppCompatTextView{
//此文本视图的最小文本大小
公共静态最终浮点最小值\文本\大小=20;
//调整大小通知的接口
公共接口OnTextResizeListener{
public void onTextResize(TextView TextView、float oldSize、float newSize);
}
//我们的椭圆弦
私有静态最终字符串mEllipsis=“…”;
//注册调整侦听器大小
私有OnTextResizeListener mTextResizeListener;
//文本和/或大小更改的标志,以强制调整大小
私有布尔值mNeedsResize=false;
//根据代码设置的文本大小。这是调整大小的起点
私有浮动mTextSize;
//起始文本大小的临时上限
私有浮点mMaxTextSize=0;
//文本大小的下限
私有浮点mMinTextSize=MIN\u TEXT\u SIZE;
//文本视图行距倍增器
私人浮动mSpacingMult=1.0f;
//文本视图附加行间距
私人浮动mSpacingAdd=0.0f;
//将省略号添加到以最小文本大小溢出的文本中
私有布尔mAddEllipsis=true;
//默认构造函数重写
公共AutoResizeTextView(上下文){
这个(上下文,空);
}
//从XML文件膨胀时的默认构造函数
公共AutoResizeTextView(上下文、属性集属性){
这(上下文,属性,0);
}
//默认构造函数重写
公共AutoResizeTextView(上下文上下文、属性集属性、int-defStyle){
超级(上下文、属性、定义样式);
mTextSize=getTextSize();
}
/**
*文本更改时,请将“强制调整大小”标志设置为true并重置文本大小。
*/
@凌驾
受保护的void onTextChanged(最终字符序列文本、最终整数开始、最终整数之前、最终整数之后){
mNeedsResize=true;
//由于此视图可以重用,因此最好重置文本大小
resetTextSize();
}
/**
*如果文字视图大小已更改,请将“强制调整大小”标志设置为true
*/
@凌驾
已更改尺寸的受保护空心(整数w、整数h、整数oldw、整数oldh){
如果(w!=oldw | | h!=oldh){
mNeedsResize=true;
}
}
/**
*注册侦听器以接收调整大小通知
*
*@param侦听器
*/
public void setOnResizeListener(AutoResizeTextView.OnTextResizeListener侦听器){
mTextResizeListener=监听器;
}
/**
*覆盖设置的文本大小以更新内部参考值
*/
@凌驾
公共void setTextSize(浮动大小){
super.setTextSize(大小);
mTextSize=getTextSize();
}
/**
*覆盖设置的文本大小以更新内部参考值
*/
@凌驾
公共void setTextSize(整数单位,浮点大小){
super.setTextSize(单位,大小);
mTextSize=getTextSize();
}
/**
*覆盖设置的行距以更新内部参考值
*/
@凌驾
公共void设置行间距(浮动添加、浮动多个){
super.setlinespace(添加,多个);
mSpacingMult=mult;
mSpacingAdd=添加;
}
/**
*设置文本大小上限并使视图无效
*
*@param maxTextSize
*/
公共void setMaxTextSize(浮动maxTextSize){
mmaxtsize=maxTextSize;
requestLayout();
使无效();
}
/**
*返回文本大小上限
*
*@返回
*/
公共浮点getMaxTextSize(){
返回mMaxTextSize;
}
/**
*设置较低的文本大小限制并使视图无效
*
*@param minTextSize
*/
公共void setMinTextSize(浮点minTextSize){
mMinTextSize=minTextSize;
requestLayout();
使无效();
}
/**
*返回较低的文本大小限制
*
*@返回
*/
公共浮点数getMinTextSi
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.yvettecolomb.myapplication.MainActivity"
tools:showIn="@layout/activity_main">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginLeft="0dp"
android:layout_marginRight="0dp"
android:layout_marginTop="10dp"
android:padding="0dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent">
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:autoSizeTextType="uniform"
android:gravity="center"
android:padding="2dp"
android:text="TEST"/>
<ImageView
android:id="@+id/image1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_margin="-10dp"
android:layout_toLeftOf="@+id/tv1"
android:src="@drawable/a"/>
<ImageView
android:id="@+id/image2"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_toRightOf="@+id/tv1"
android:src="@drawable/b"/>
<ImageView
android:id="@+id/image3"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_below="@+id/tv1"
android:layout_margin="-10dp"
android:layout_toLeftOf="@+id/tv2"
android:src="@drawable/c"/>
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tv1"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:autoSizeTextType="uniform"
android:gravity="center"
android:padding="2dp"
android:text="test test test test test"/>
<ImageView
android:id="@+id/image4"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_below="@+id/tv1"
android:layout_toRightOf="@+id/tv2"
android:src="@drawable/d"/>
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
<RelativeLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/rl_flashcard_back"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.AppCompatTextView
android:id="@+id/tv_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
app:autoSizeMaxTextSize="16sp"
app:autoSizeMinTextSize="8sp"
app:autoSizeStepGranularity="1sp"
app:autoSizeTextType="uniform"
/>
android.support.v7.widget.AppCompatTextView tv_text = mRootView.findViewById(R.id.tv_text);