自定义view实现图文环绕的效果

为了实现类似于word里面的图文环绕的效果，参考了网络上的很多方法后选择了自定义view的方法。因为本人对webView的使用不是很擅长。

参考了文章：http://mobile.51cto.com/abased-375949.htm

后来发现，其实这个是已经封装好的方法。都不用我们去想算法。我真心感谢它的原始作者。为了以后引用和自我的巩固，所以决定写下来。

首先，它的自定义view已经是成品了。我当一次搬运工了。

FloatImageText.java

package com.esri.arcgis.android.samples.helloworld;

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Paint.FontMetrics;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;

/**
* 模拟CSS中的float浮动效果
*/
public class FloatImageText extends View {
private Bitmap mBitmap;
private final Rect bitmapFrame = new Rect();
private final Rect tmp = new Rect();
private int mTargetDentity = DisplayMetrics.DENSITY_DEFAULT;

private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private String mText;
private ArrayList<TextLine> mTextLines;
private final int[] textSize = new int[2];

public FloatImageText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

public FloatImageText(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

public FloatImageText(Context context) {
super(context);
init();
}

private void init() {
mTargetDentity = getResources().getDisplayMetrics().densityDpi;
mTextLines = new ArrayList<TextLine>();

mPaint.setTextSize(14);
mPaint.setColor(Color.BLACK);

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int w = 0, h = 0;
// 图片大小
w += bitmapFrame.width();
h += bitmapFrame.height();

// 文本宽度
if (null != mText && mText.length() > 0) {
mTextLines.clear();
int size = resolveSize(Integer.MAX_VALUE, widthMeasureSpec);
measureAndSplitText(mPaint, mText, size);
final int textWidth = textSize[0], textHeight = textSize[1];
w += textWidth; // 内容宽度
if (h < textHeight) { // 内容高度
h = (int) textHeight;
}
}

w = Math.max(w, getSuggestedMinimumWidth());
h = Math.max(h, getSuggestedMinimumHeight());

setMeasuredDimension(resolveSize(w, widthMeasureSpec),
resolveSize(h, heightMeasureSpec));
}

@Override
protected void onDraw(Canvas canvas) {
// 绘制图片
if (null != mBitmap) {
canvas.drawBitmap(mBitmap, null, bitmapFrame, null);
}

// 绘制文本
TextLine line;
final int size = mTextLines.size();
for (int i = 0; i < size; i++) {
line = mTextLines.get(i);
canvas.drawText(line.text, line.x, line.y, mPaint);
}
System.out.println(mTextLines);
}

public void setImageBitmap(Bitmap bm) {
setImageBitmap(bm, null);
}

public void setImageBitmap(Bitmap bm, int left, int top) {
setImageBitmap(bm, new Rect(left, top, 0, 0));
}

public void setImageBitmap(Bitmap bm, Rect bitmapFrame) {
mBitmap = bm;
computeBitmapSize(bitmapFrame);
requestLayout();
invalidate();
}

public void setText(String text) {
mText = text;
requestLayout();
invalidate();
}

private void computeBitmapSize(Rect rect) {
if (null != rect) {
bitmapFrame.set(rect);
}
if (null != mBitmap) {
if (rect.right == 0 && rect.bottom == 0) {
final Rect r = bitmapFrame;
r.set(r.left, r.top,
r.left + mBitmap.getScaledHeight(mTargetDentity), r.top
+ mBitmap.getScaledHeight(mTargetDentity));
}
} else {
bitmapFrame.setEmpty();
}
}

private void measureAndSplitText(Paint p, String content, int maxWidth) {
FontMetrics fm = mPaint.getFontMetrics();
final int lineHeight = (int) (fm.bottom - fm.top);

final Rect r = new Rect(bitmapFrame);
// r.inset(-5, -5);

final int length = content.length();
int start = 0, end = 0, offsetX = 0, offsetY = 0;
int availWidth = maxWidth;
TextLine line;
boolean onFirst = true;
boolean newLine = true;
while (start < length) {
end++;
if (end == length) { // 剩余的不足一行的文本
if (start <= length - 1) {
if (newLine)
offsetY += lineHeight;
line = new TextLine();
line.text = content.substring(start, end - 1);
line.x = offsetX;
line.y = offsetY;
mTextLines.add(line);
}
break;
}
p.getTextBounds(content, start, end, tmp);
if (onFirst) { // 确定每个字符串的坐标
onFirst = false;
final int height = lineHeight + offsetY;
if (r.top >= height) { // 顶部可以放下一行文字
offsetX = 0;
availWidth = maxWidth;
newLine = true;
} else if (newLine
&& (r.bottom >= height && r.left >= tmp.width())) { // 中部左边可以放文字
offsetX = 0;
availWidth = r.left;
newLine = false;
} else if (r.bottom >= height
&& maxWidth - r.right >= tmp.width()) { // 中部右边
offsetX = r.right;
availWidth = maxWidth - r.right;
newLine = true;
} else { // 底部
offsetX = 0;
availWidth = maxWidth;
if (offsetY < r.bottom)
offsetY = r.bottom;
newLine = true;
}
}

if (tmp.width() > availWidth) { // 保存一行能放置的最大字符串
onFirst = true;
line = new TextLine();
line.text = content.substring(start, end - 1);
line.x = offsetX;
mTextLines.add(line);
if (newLine) {
offsetY += lineHeight;
line.y = offsetY;
} else {
line.y = offsetY + lineHeight;
}

start = end - 1;
}
}
textSize[1] = offsetY;
}

class TextLine {
String text;
int x;
int y;

@Override
public String toString() {
return "TextLine [text=" + text + ", x=" + x + ", y=" + y + "]";
}
}
}

接下来就是如何使用这个view了。我粗略滴了解了一下，使用只要在需要调用的地方添加text内容和图片内容并且设置一下图片显示的位置就可以了。我是显示在callout内。

这里是我callout的内部布局文件的设置：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<TextView
android:id="@+id/callouttile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColor="#000000" />

<ImageButton
android:id="@+id/exitcallout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="@drawable/exit" />
</LinearLayout>

<cn.com.esrichina.imagetext.FloatImageText
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>

接下来是我的callout显示的时候，对自定义view的初始化和调用：

private void DisplayCallout(Point point) {
LayoutInflater inflater = LayoutInflater.from(GoogleMapActivity.this);
View view = inflater.inflate(R.layout.callout, null);
calloutTile = (TextView) view.findViewById(R.id.callouttile);
FloatImageText imageText;
imgTxtView = (FloatImageText) view.findViewById(R.id.view);
imgTxtView.setMinimumWidth(300);
imgTxtView.setMinimumHeight(100);
callout = mapView.getCallout();
SetCalloutContent(checkGraphic);

callout.setStyle(R.xml.calloutstyle);
callout.setMaxWidth(400);
callout.setMaxHeight(400);
callout.refresh();
callout.show(point, view);
}

private void SetCalloutContent(int i) {

int a, b;
a = 2;
b = 6;
// callout内部控件设置
if (isRelease.get(i) == 1) {
calloutTile.getPaint().setFakeBoldText(true);// 字体加粗
calloutTile.setText(stnm.get(i) + "(已解除)");
if (lev.get(i) == 1) {
Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.drawable.icon_blue);
imgTxtView.setImageBitmap(bm, a, b);// 调节图片显示的方位。
} else {
Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.drawable.icon_yellow);
imgTxtView.setImageBitmap(bm, a, b);
}
} else {
calloutTile.getPaint().setFakeBoldText(true);// 字体加粗
calloutTile.setText(stnm.get(i));
if (lev.get(i) == 1) {
Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.drawable.icon_blue);
imgTxtView.setImageBitmap(bm, a, b);
} else {
Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.drawable.icon_yellow);
imgTxtView.setImageBitmap(bm, a, b);
}
}
imgTxtView.setText(content.get(i));// end callout config

}

这样子就已经实现了调用。效果图再上一张吧。



最后在附上网上找到的利用webview的技术贴地址：http://www.easymorse.com/index.php/archives/1464