假設你有一個正常的TextView,在其中寫入了「Stackoverflow」,是否可以將TextView旋轉-90°,讓S位於底部,W位於屏幕頂部? 當然,我可以把我的文字寫成圖片,旋轉並使用它,但我現在對文字很感興趣。 謝謝。是否有可能在android中的textview中垂直寫入?
回答
你可以設置你的TextView,你通常會做
例如:
<TextView android:id="@+id/txtview"
android:layout_height="fill_parent"
android:layout_width="wrap_content" />
,寫在你的活動
- 功能反轉字符在文本
- 在每個字符後插入
\n
然後將文本設置爲TextView。
如果你不想插入\n
,你必須設置的android:layout_width
大小和字體大小玩不要有2個字符在同一行,並沒有截斷
編輯 如果我裝修已經正確理解了你,你可以通過使用動畫來獲得你想要的。
例如
在res/animation/myanim.xml
:
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:toDegrees="-90"
android:pivotX="50%"
android:duration="0" />
你將不得不與這個文件進行播放來定義您希望您的文本視圖放置。
在你的活動:
TextView t = (TextView)findViewById(R.id.txtview);
String txt = "Stackoverflow";
t.setText(txt);
RotateAnimation ranim = (RotateAnimation)AnimationUtils.loadAnimation(this, R.anim.myanim);
ranim.setFillAfter(true); //For the textview to remain at the same place after the rotation
t.setAnimation(ranim);
試試這個。這對我來說可以。它可以垂直顯示一行文本,但只顯示一行。顏色,尺寸,襯墊,邊距和背景都可以正常工作。
public class VerticalTextView extends TextView {
public VerticalTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public VerticalTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public VerticalTextView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
final ColorStateList csl = getTextColors();
final int color = csl.getDefaultColor();
final int paddingBottom = getPaddingBottom();
final int paddingTop = getPaddingTop();
final int viewWidth = getWidth();
final int viewHeight = getHeight();
final TextPaint paint = getPaint();
paint.setColor(color);
final float bottom = viewWidth * 9.0f/11.0f;
Path p = new Path();
p.moveTo(bottom, viewHeight - paddingBottom - paddingTop);
p.lineTo(bottom, paddingTop);
canvas.drawTextOnPath(getText().toString(), p, 0, 0, paint);
}
}
如果您正在使用API 11或更高版本,您可以嘗試:
TextView t = (TextView) findViewById(R.id.txtview);
String txt = "Stackoverflow";
t.setText(txt);
t.setRotation(90); // 90 degree rotation
這將有問題與textview界限。 onMeasure()應該重新定義它。 – 2013-04-14 08:43:45
我認爲這不是問題,是嗎?只需切換寬度和高度... – Chris623 2017-09-15 05:11:06
爲我工作:
public class VerticalTextView extends TextView {
private int _width, _height;
private final Rect _bounds = new Rect();
public VerticalTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public VerticalTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public VerticalTextView(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// vise versa
_height = getMeasuredWidth();
_width = getMeasuredHeight();
setMeasuredDimension(_width, _height);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
canvas.translate(_width, _height);
canvas.rotate(-90);
TextPaint paint = getPaint();
paint.setColor(getTextColors().getDefaultColor());
String text = text();
paint.getTextBounds(text, 0, text.length(), _bounds);
canvas.drawText(text, getCompoundPaddingLeft(), (_bounds.height() - _width)/2, paint);
canvas.restore();
}
private String text() {
return super.getText().toString();
}
}
XML:
<VerticalTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center_vertical"
android:background="@color/feedback_background"
android:padding="4dip"
android:text="@string/feedback"
android:textColor="@color/feedback_text_color"
android:textSize="@dimen/text_xlarge" />
我知道這不是什麼大不了的事情,但是如果有一天像我一樣的n00b嘗試實現它並獲得一些錯誤,請嘗試使用:
完美的作品。謝謝! – Lancelot 2016-06-15 08:53:59
如何旋轉到90度而不是-90? – Dharmendra 2016-06-22 10:48:53
我們可以設置使用XML視圖旋轉
<TextView android:id="@+id/txtview"
android:rotation="-90"
android:text="123"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />
這有效,但之後很難使用UI編輯器 – Louis 2017-12-06 16:09:33
我在另一個StackOverflow question中提供了一個解決方案。您可以通過從View擴展並覆蓋其onMeasure()
和onDraw()
方法來獲得垂直TextView。但是,它不會支持所有的TextView功能,而是它的主要功能,如填充,大小,顏色和字體。
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.os.Build;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class VerticalLabelView extends View
{
private final String LOG_TAG = "VerticalLabelView";
private final int DEFAULT_TEXT_SIZE = 30;
private int _ascent = 0;
private int _leftPadding = 0;
private int _topPadding = 0;
private int _rightPadding = 0;
private int _bottomPadding = 0;
private int _textSize = 0;
private int _measuredWidth;
private int _measuredHeight;
private Rect _textBounds;
private TextPaint _textPaint;
private String _text = "";
private TextView _tempView;
private Typeface _typeface = null;
private boolean _topToDown = false;
public VerticalLabelView(Context context)
{
super(context);
initLabelView();
}
public VerticalLabelView(Context context, AttributeSet attrs)
{
super(context, attrs);
initLabelView();
}
public VerticalLabelView(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
initLabelView();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public VerticalLabelView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)
{
super(context, attrs, defStyleAttr, defStyleRes);
initLabelView();
}
private final void initLabelView()
{
this._textBounds = new Rect();
this._textPaint = new TextPaint();
this._textPaint.setAntiAlias(true);
this._textPaint.setTextAlign(Paint.Align.CENTER);
this._textPaint.setTextSize(DEFAULT_TEXT_SIZE);
this._textSize = DEFAULT_TEXT_SIZE;
}
public void setText(String text)
{
this._text = text;
requestLayout();
invalidate();
}
public void topToDown(boolean topToDown)
{
this._topToDown = topToDown;
}
public void setPadding(int padding)
{
setPadding(padding, padding, padding, padding);
}
public void setPadding(int left, int top, int right, int bottom)
{
this._leftPadding = left;
this._topPadding = top;
this._rightPadding = right;
this._bottomPadding = bottom;
requestLayout();
invalidate();
}
public void setTextSize(int size)
{
this._textSize = size;
this._textPaint.setTextSize(size);
requestLayout();
invalidate();
}
public void setTextColor(int color)
{
this._textPaint.setColor(color);
invalidate();
}
public void setTypeFace(Typeface typeface)
{
this._typeface = typeface;
this._textPaint.setTypeface(typeface);
requestLayout();
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
try
{
this._textPaint.getTextBounds(this._text, 0, this._text.length(), this._textBounds);
this._tempView = new TextView(getContext());
this._tempView.setPadding(this._leftPadding, this._topPadding, this._rightPadding, this._bottomPadding);
this._tempView.setText(this._text);
this._tempView.setTextSize(TypedValue.COMPLEX_UNIT_PX, this._textSize);
this._tempView.setTypeface(this._typeface);
this._tempView.measure(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
this._measuredWidth = this._tempView.getMeasuredHeight();
this._measuredHeight = this._tempView.getMeasuredWidth();
this._ascent = this._textBounds.height()/2 + this._measuredWidth/2;
setMeasuredDimension(this._measuredWidth, this._measuredHeight);
}
catch (Exception e)
{
setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
Log.e(LOG_TAG, Log.getStackTraceString(e));
}
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
if (!this._text.isEmpty())
{
float textHorizontallyCenteredOriginX = this._measuredHeight/2f;
float textHorizontallyCenteredOriginY = this._ascent;
canvas.translate(textHorizontallyCenteredOriginY, textHorizontallyCenteredOriginX);
float rotateDegree = -90;
float y = 0;
if (this._topToDown)
{
rotateDegree = 90;
y = this._measuredWidth/2;
}
canvas.rotate(rotateDegree);
canvas.drawText(this._text, 0, y, this._textPaint);
}
}
}
現在有可能做到這一點的XML:http://stackoverflow.com/questions/3774770/sideways-view-with-xml-android – chobok 2013-08-17 06:19:18