寫下這篇文章是不爲更好的去理解自定義view機制和原理。
有時候會遇到這種需求,就是一個textview有多行(大於兩行),但是隻是title和同容不一致,而第二行又需要頂格來,遇到這種情況怎麼處理呢?
下面是給出實現效果圖:
很好,這個效果圖你已經看到了,後面話不多說,直接給出重要代碼。
自定義view的 TwoStyleTextView類代碼如下:
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import com.xjtu.yuzhuo.twostyletextview.R;
/**
* Created by yuzhuo on 16/9/2.
*/
public class TwoStyleTextView extends View{
private Context context;
/**
* 內容一行包行多少個字符
*/
private int rowsCount;
/**
* 第一行在哪處開始字符換行
*/
private int enterofIndex;
/**
* 單行的高度
*/
private float textHeight;
/**
* 行數
*/
private int rows;
/**
* title文本
*/
private String mTitleText;
/**
* title文本的顏色
*/
private int mTitleTextColor;
/**
* titel文本的大小
*/
private int mTitleTextSize;
/**
* content文本
*/
private String mContentText;
/**
* content文本的顏色
*/
private int mContentTextColor;
/**
* content文本的大小
*/
private int mContentTextSize;
/**
* 繪製時控制文本繪製的範圍
*/
private Rect mtitleBound,mcontentBound,testBound;
private Paint mtitlePaint,mcontentPaint,testPaint;
public TwoStyleTextView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
this.context = context;
}
public TwoStyleTextView(Context context)
{
this(context, null);
this.context = context;
}
/**
* 獲得我自定義的樣式屬性
*
* @param context
* @param attrs
* @param defStyle
*/
public TwoStyleTextView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
this.context = context;
/**
* 獲得我們所定義的自定義樣式屬性
*/
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.TwoStyleTextView, defStyle, 0);
int n = a.getIndexCount();
for (int i = 0; i < n; i++)
{
int attr = a.getIndex(i);
switch (attr)
{
case R.styleable.TwoStyleTextView_titleText:
mTitleText = a.getString(attr);
break;
case R.styleable.TwoStyleTextView_titleTextColor:
// 默認顏色設置爲黑色
mTitleTextColor = a.getColor(attr, Color.BLACK);
break;
case R.styleable.TwoStyleTextView_titleTextSize:
// 默認設置爲16sp,TypeValue也可以把sp轉化爲px
mTitleTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
case R.styleable.TwoStyleTextView_contentText:
mContentText = a.getString(attr);
break;
case R.styleable.TwoStyleTextView_contentTextColor:
// 默認顏色設置爲黑色
mContentTextColor = a.getColor(attr, Color.BLACK);
break;
case R.styleable.TwoStyleTextView_contentTextSize:
// 默認設置爲16sp,TypeValue也可以把sp轉化爲px
mContentTextSize = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break;
}
}
a.recycle();
/**
* 獲得繪製文本的寬和高
*/
mtitlePaint = new Paint();
mtitlePaint.setTextSize(mTitleTextSize);
// mPaint.setColor(mTitleTextColor);
mtitleBound = new Rect();
mtitlePaint.getTextBounds(mTitleText, 0, mTitleText.length(), mtitleBound);
mcontentPaint = new Paint();
mcontentPaint.setTextSize(mContentTextSize);
mcontentBound = new Rect();
mcontentPaint.getTextBounds(mContentText, 0, mContentText.length(), mcontentBound);
testPaint = new Paint();
testPaint.setTextSize(mContentTextSize);
testBound = new Rect();
testPaint.getTextBounds("我,",0,"我,".length(),testBound);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int width;
int height ;
if (widthMode == MeasureSpec.EXACTLY)
{
width = widthSize;
} else
{
mtitlePaint.setTextSize(mTitleTextSize);
mtitlePaint.getTextBounds(mTitleText, 0, mTitleText.length(), mtitleBound);
mcontentPaint.setTextSize(mContentTextSize);
mcontentPaint.getTextBounds(mContentText, 0, mContentText.length(), mcontentBound);
float wordWidth = (float)testBound.width()-6;
float textWidth = mTitleText.length()*wordWidth+mContentText.length()*wordWidth;
int desired = (int) (getPaddingLeft() + textWidth + getPaddingRight());
if(desired%widthSize==0){
rows = desired/widthSize;
}else{
rows = desired/widthSize + 1;
}
if(rows>1){
rowsCount = (int)((widthSize-getPaddingLeft()*2) / wordWidth);
enterofIndex = (int)((widthSize - mtitleBound.width())/wordWidth)-1;
}
width = desired<=widthSize?desired:widthSize;
}
if (heightMode == MeasureSpec.EXACTLY)
{
height = heightSize;
} else
{
mtitlePaint.setTextSize(mTitleTextSize);
mtitlePaint.getTextBounds(mTitleText, 0, mTitleText.length(), mtitleBound);
mcontentPaint.setTextSize(mContentTextSize);
mcontentPaint.getTextBounds(mContentText, 0, mContentText.length(), mcontentBound);
textHeight = mtitleBound.height()>mcontentBound.height()?mtitleBound.height():mcontentBound.height();
int desired = (int) (getPaddingTop() + textHeight*rows+ getPaddingTop()*(rows-1) + getPaddingBottom());
height = desired<=heightSize?desired:heightSize;
}
setMeasuredDimension(width, height);
}
@Override
protected void onDraw(Canvas canvas) {
mtitlePaint.setColor(Color.TRANSPARENT);
canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mtitlePaint);
mtitlePaint.setColor(mTitleTextColor);
mcontentPaint.setColor(mContentTextColor);
canvas.drawText(mTitleText, getPaddingLeft(),textHeight+getPaddingTop(), mtitlePaint);
canvas.drawText(mContentText.substring(0,enterofIndex), getPaddingLeft()*2+mtitleBound.width(),textHeight+getPaddingTop(), mcontentPaint);
for (int i = 1;rows>1&&i<rows;i++){
if(i == rows -1){//最後一行
canvas.drawText(mContentText.substring(enterofIndex+(i-1)*rowsCount), getPaddingLeft(),(textHeight+getPaddingTop())*(i+1), mcontentPaint);
}else{
canvas.drawText(mContentText.substring(enterofIndex+(i-1)*rowsCount,enterofIndex+i*rowsCount), getPaddingLeft(),(textHeight+getPaddingTop())*(i+1), mcontentPaint);
}
}
}
}
attrs.xml文件中的style代碼如下:
<declare-styleable name="TwoStyleTextView">
<attr name="titleText" format="string" />
<attr name="titleTextColor" format="color"/>
<attr name="titleTextSize" format="dimension"/>
<attr name="contentText" format="string" />
<attr name="contentTextColor" format="color"/>
<attr name="contentTextSize" format="dimension"/>
</declare-styleable>
佈局文件代碼如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:twostyle="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.xjtu.yuzhuo.twostyletextview.MainActivity">
<com.xjtu.yuzhuo.twostyletextview.view.TwoStyleTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:padding="5dp"
twostyle:titleText="姓名:"
twostyle:titleTextSize="18sp"
twostyle:titleTextColor="@android:color/holo_red_light"
twostyle:contentText="一直以爲幸福在遠方,在可以追逐的未來。後來才發現,那些擁抱過的人,握過的手、唱過的歌、流過的淚、愛過的人、所謂的曾經,就是幸福。在無數的夜裏,說過的話、打過的電話,看過的電影、流過的眼淚、看見的或看不見的感動,我們都曾經有過,然後在時間的穿梭中,一切成爲了永恆!"
twostyle:contentTextSize="18sp"
twostyle:contentTextColor="@android:color/holo_blue_bright"
/>
</RelativeLayout>
好了,全部都給出來了自己去試吧!
最後,如果需要項目工程的可以看github:https://github.com/yuxiaoxi/TwoStyleTextView,
謝謝大家批評指正,多點贊