Android之垂直显示TextView

Posted 2020-08-07 CXQDCXQD

                                        android之垂直显示TextView

            1因为界面需求原因，需要TextView垂直显示，话不多说，看代码，我也是搜的例子，在此感谢写这个例子的大神,在此做个笔记和分享给大家

             2.用到了自定义控件的知识，下面就来看看如何自定义的

            java代码如下：

            

package com.android.xxx;

import android.content.Context;

import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.TextView;

public class VerticalTextView extends TextView{
final boolean topDown;

public VerticalTextView(Context context, AttributeSet attrs){
super(context, attrs);
final int gravity = getGravity();
if(Gravity.isVertical(gravity) && (gravity&Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {
setGravity((gravity&Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);
topDown = false;
}else
topDown = true;
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
super.onMeasure(heightMeasureSpec, widthMeasureSpec);
setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
}

@Override
protected boolean setFrame(int l, int t, int r, int b){
return super.setFrame(l, t, l+(b-t), t+(r-l));
}

@Override
public void draw(Canvas canvas){
if(topDown){
canvas.translate(getHeight(), 0);
canvas.rotate(90);
}else {
canvas.translate(0, getWidth());
canvas.rotate(-90);
}
canvas.clipRect(0, 0, getWidth(), getHeight(), android.graphics.Region.Op.REPLACE);
super.draw(canvas);
}
}

然后看layout xml布局文件中

此控件的写法：

<com.android.xxx.VerticalTextView
android:id="@+id/xxxName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_marginRight="14dp"
android:textSize="27dp"
android:gravity="bottom|right"
android:maxLength="15"
android:visibility="visible"
android:textColor="#ffffff"
/>