竖直显示Text

最近的项目用到了一个效果，textview需要旋转90度，于是写了一个小控件，以备不时之需。

效果图如下：

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其实实现是很简单的，利用了canvas.drawTextOnPath(), 构建好path上的点就可以了。

代码不多就都贴出来了：

package com.ray.verticaltextview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout.LayoutParams;

public class VerticalTextView extends View {

/**

* the text which will be drawn vertical
*/
private String verticalText = "";

private Path vt_TextPath = new Path();

private Paint vt_TextPaint = new Paint();

private static final String TAG = "VerticalTextView";

private int vt_ViewWidth = 0;

private int vt_ViewHeight = 0;

/*

* private final static int GRAVITY_LEFT = 0X00001; private final static int

* GRAVITY_RIGHT = 0X00010; private final static int GRAVITY_TOP = 0X00100;

* private final static int GRAVITY_BOTTOM = 0X01000; private final static

* int GRAVITY_CENTER = 0X10000;
*/

private final static int GRAVITY_LEFT = 0;
private final static int GRAVITY_RIGHT = 1;
private final static int GRAVITY_TOP = 2;
private final static int GRAVITY_BOTTOM = 3;
private final static int GRAVITY_CENTER = 4;

private final static boolean DEBUG = true;

/**

* the default minimum offset in horizontal
*/
private final static int DEFAULT_HORIZONTAL_OFFSET = 20;

/**

* the default minimum offset in vertical
*/
private final static int DEFAULT_VERTICAL_OFFSET = 20;

/**

* the gravity of vertical text
*/
private int vt_ViewGravity = 4;

/**

* write the text from bottom to top, or from top to bottom
*/
private boolean isAsc = true;

/**

* the rectangle of vertical text
*/
private Rect vt_TextRect = new Rect();

public VerticalTextView(Context context, AttributeSet attrs) {
super(context, attrs);

}

/**

* set the vertical text

* 

* @author ray Feb 21, 2012

* @param verticalText

* @param textSize

*
if textSize <= 0, the default size will be used

* @param isAsc

*
the direction of text is ascend or not

* @param typeface

*
use default if typeface is null
*/
public void setVerticalText(String verticalText, float textSize, boolean isAsc, Typeface typeface) {
this.verticalText = verticalText;
if (textSize > 0)
this.vt_TextPaint.setTextSize(textSize);
this.isAsc = isAsc;
if (typeface != null)

vt_TextPaint.setTypeface(typeface);

reLayoutView();

}

/**

* set vertical text color

* 

* @author ray Feb 21, 2012

* @param color
*/
public void setTextColor(int color) {

vt_TextPaint.setColor(color);

invalidate();

}

/**

* set vertical text size TODO: the size can't be modified by code, it will

* make the text out of the place

* 

* @author ray Feb 21, 2012

* @param textSize
*/
private void setTextSize(float textSize) {

vt_TextPaint.setTextSize(textSize);

reLayoutView();

}

/**

* set the size of view

* 

* @author ray Feb 21, 2012

* @param vt_ViewWidth

* @param vt_ViewHeight
*/
public void setVerticalTextViewSize(int vt_ViewWidth, int vt_ViewHeight) {
this.vt_ViewHeight = vt_ViewHeight;
this.vt_ViewWidth = vt_ViewWidth;

}

/**

* reset the layout of vertical view

* 

* @author ray Feb 21, 2012
*/
public void reLayoutView() {

vt_TextPaint.getTextBounds(verticalText, 0, verticalText.length(), vt_TextRect);

if (DEBUG) {

Log.d(TAG, "=====================Rect=====================");

Log.d(TAG, "width: " + vt_TextRect.height() + "==" + "height: " + vt_TextRect.width());

Log.d(TAG, "==============================================");

}
int offsetHorizontal = vt_ViewWidth - vt_TextRect.height();
int offsetVertical = vt_ViewHeight - vt_TextRect.width();


offsetHorizontal = Math.max(offsetHorizontal, DEFAULT_HORIZONTAL_OFFSET);

offsetVertical = Math.max(offsetVertical, DEFAULT_VERTICAL_OFFSET);

vt_ViewWidth = offsetHorizontal + vt_TextRect.height();

vt_ViewHeight = offsetVertical + vt_TextRect.width();


LayoutParams params = new LayoutParams(vt_ViewWidth, vt_ViewHeight);

setLayoutParams(params);
int startX = vt_ViewWidth / 2;
if (isAsc) {

vt_TextPath.moveTo(startX, vt_ViewHeight - offsetVertical / 2);

vt_TextPath.cubicTo(startX, vt_ViewHeight - offsetVertical / 2, startX, vt_ViewHeight - offsetVertical / 2, startX, 0);

} else {

vt_TextPath.moveTo(startX, offsetVertical / 2);

vt_TextPath.cubicTo(startX, offsetVertical / 2, startX, offsetVertical / 2, startX, vt_ViewHeight);

}


invalidate();

}


@Override
protected void onDraw(Canvas canvas) {

Log.d(TAG, "VerticalTextView onDraw(), verticalText: " + verticalText);
if (!verticalText.equals("")) {

canvas.drawTextOnPath(verticalText, vt_TextPath, 0, vt_TextRect.height() / 2, vt_TextPaint);

}

}

}

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.main);

VerticalTextView mVerticalTextView = (VerticalTextView) findViewById(R.id.verticalTv);

mVerticalTextView.setTextColor(Color.RED);

mVerticalTextView.setVerticalText("Hello00000000000000", 30, true, null);

}

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还有一些功能没有实现，比如对齐方式。而且再次修改字体大小，内容还有点问题。