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只要在圖片范圍之內，文字可隨意點擊移動。

[java] view plaincopy

package?xiaosi.GetTextImage;??

??

??

import?android.content.Context;??

import?android.content.res.Resources;??

import?android.graphics.Bitmap;??

import?android.graphics.BitmapFactory;??

import?android.graphics.Canvas;??

import?android.graphics.Paint;??

import?android.util.DisplayMetrics;??

import?android.view.MotionEvent;??

import?android.view.View;??

import?android.view.WindowManager;??

??

public?class?GetTextImage?extends?View??

{??

????private?float?x?=?20,?y?=?40;??

????private?static?float?windowWidth;??

????private?static?float?windowHeight;??

????private?static?float?left?=?0;??????//圖片在屏幕中位置X坐標??

????private?static?float?top?=?0;???????//圖片在屏幕中位置Y坐標??

????private?String?str?=?"我愛你";??

????private?DisplayMetrics?dm?=?new?DisplayMetrics();??//用于獲取屏幕的高度和寬度??

????private?WindowManager?windowManager;??

????private?Bitmap?newbitmap;??

??

????public?GetTextImage(Context?context)??

????{??

????????super(context);??

????????windowManager?=?(WindowManager)?context??

????????????????.getSystemService(Context.WINDOW_SERVICE);??

????????//屏幕的寬度??

????????windowWidth?=?windowManager.getDefaultDisplay().getWidth();??

????????//屏幕的高度??

????????windowHeight?=?windowManager.getDefaultDisplay().getHeight();??

????}??

??

????public?void?onDraw(Canvas?canvas)??

????{??

????????Resources?res?=?getResources();??

????????Bitmap?bmp?=?BitmapFactory.decodeResource(res,?R.drawable.b);??

????????newbitmap?=?getTextImage(bmp,?str,?x,?y);??

????????canvas.drawBitmap(newbitmap,?0,?0,?null);??

????}??

????/**?

?????*?返回值:?Bitmap?參數：原圖片,文字?功能:?根據給定的文字生成相應圖片?

?????*??

?????*?@param?originalMap??

?????*?@param?text??文字?

?????*?@param?x??點擊的X坐標?

?????*?@param?y??點擊的Y坐標?

?????*?@return?

?????*/??

????public?static?Bitmap?getTextImage(Bitmap?originalMap,?String?text,?float?x,??

????????????float?y)??

????{??

????????float?bitmapWidth?=?originalMap.getWidth();??

????????float?bitmapHeight?=?originalMap.getHeight();??

????????//?定義畫布??

????????Canvas?canvas?=?new?Canvas(originalMap);??

????????//?定義畫筆??

????????Paint?paint?=?new?Paint();??

????????//獲得文本的長度（像素）??

????????float?textWidth?=?paint.measureText(text);???

????????canvas.drawBitmap(originalMap,?0,?0,?null);??

??????????

????????//?如果圖片寬度小于屏幕寬度??

????????if?(left?+?bitmapWidth?<?windowWidth)??

????????{??

????????????//?右邊界??

????????????if?(x?>=?left?+?bitmapWidth?-?textWidth)??

????????????{??

????????????????x?=?left?+?bitmapWidth?-?textWidth;??

????????????}??

????????????//?左邊界??

????????????else?if?(x?<=?left)??

????????????{??

????????????????x?=?left;??

????????????}??

????????}??

????????else??

????????{??

????????????//?右邊界??

????????????if?(x?>=?windowWidth?-?textWidth)??

????????????{??

????????????????x?=?windowWidth?-?textWidth;??

????????????}??

????????????//?左邊界??

????????????else?if?(x?<=?0)??

????????????{??

????????????????x?=?0;??

????????????}??

????????}??

????????//?如果圖片高度小于屏幕高度??

????????if?(top?+?bitmapHeight?<?windowHeight)??

????????{??

????????????//?下??

????????????if?(y?>=?top?+?bitmapHeight)??

????????????{??

????????????????y?=?top?+?bitmapHeight;??

????????????}??

????????????//?上??

????????????else?if?(y?<=?top?+?10)??

????????????{??

????????????????y?=?top?+?10;??

????????????}??

????????}??

????????else??

????????{??

????????????if?(y?>=?windowHeight)??

????????????{??

????????????????y?=?windowHeight;??

????????????}??

????????????else?if?(y?<=?0)??

????????????{??

????????????????y?=?0;??

????????????}??

????????}??

??????????

????????//?添加字??

????????canvas.drawText(text,?x,?y,?paint);??

????????return?originalMap;??

????}??

????@Override??

????public?boolean?onTouchEvent(MotionEvent?event)??

????{??

????????if?(event.getAction()?==?MotionEvent.ACTION_DOWN)??

????????{??

????????????x?=?event.getX();??

????????????y?=?event.getY();??

????????????//?重繪??

????????????invalidate();??

????????}??

????????return?true;??

????}??

}??

[java] view plaincopy

package?xiaosi.GetTextImage;??

??

import?android.app.Activity;??

import?android.os.Bundle;??

??

public?class?GetTextImageActivity?extends?Activity?{??

????/**?Called?when?the?activity?is?first?created.?*/??

????private?GetTextImage?get;??

????@Override??

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????get?=?new?GetTextImage(this);??

????????setContentView(get);??

????}??

}??

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