arcgis for android 中文显示问题

对于TextSymbol中中文不能显示的问题，网上找到了几种解决方案，对比后采用
ArcGIS For Android 中文标注不显示解决方案。

解决方案

这个方案是把文字转成bitmap，再以PictureMarkerSymbol的形式加到graphic上，关键代码：

public static Drawable createMapBitMap(String text) {          Paint paint = new Paint();          paint.setColor(Color.BLACK);          paint.setTextSize(20);          paint.setAntiAlias(true);          paint.setTextAlign(Align.CENTER);          float textLength = paint.measureText(text);          int width = (int) textLength + 10;          int height = 40;          Bitmap newb = Bitmap.createBitmap(width, height, Config.ARGB_8888);          Canvas cv = new Canvas(newb);          cv.drawColor(Color.parseColor("#00000000"));          cv.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG                  | Paint.FILTER_BITMAP_FLAG));          cv.drawText(text, width / 2, 20, paint);          cv.save(Canvas.ALL_SAVE_FLAG);// 保存          cv.restore();// 存储          return new BitmapDrawable(newb);      }  

这种方式会对性能造成影响，经过我的测试，添加100个文字标注需要3·4秒，而同样的文字，使用TextSymbol只有1秒，所以使用的时候要注意这个问题。

我对这个方法进行了完善，加入了不同dpi屏幕的大小适配和文字显示位置的设置，并打包成一个类，方便以后直接使用。

完整类：

public class CHTextSymbol{    int textSize;    int textColor;    String text;    float dpi;    int horizontalAlignment=2;    int verticalAlignment=0;    public static final int LEFT=0;    public static final int CENTER=1;    public static final int RIGHT=2;    public static final int TOP=0;    public static final int BOTTOM=2;    public CHTextSymbol(int textSize, int textColor, String text, Context context) {        this.textSize = textSize;        this.textColor = textColor;        this.text = text;        DisplayMetrics metrics= context.getResources().getDisplayMetrics();        int ppi=metrics.densityDpi;        dpi=ppi/160f;    }    public PictureMarkerSymbol build(int horizontalAlignment,int verticalAlignment){        this.horizontalAlignment=horizontalAlignment;        this.verticalAlignment=verticalAlignment;        PictureMarkerSymbol symbol=new PictureMarkerSymbol(createMapBitMap(text));        return symbol;    }    public PictureMarkerSymbol build(){        PictureMarkerSymbol symbol=new PictureMarkerSymbol(createMapBitMap(text));        return symbol;    }    /**     * 文字转换BitMap     * @param text     * @return     */    private Drawable createMapBitMap(String text) {        Paint paint = new Paint();        paint.setColor(textColor);        paint.setTextSize(textSize*dpi);        paint.setAntiAlias(true);        paint.setTextAlign(Paint.Align.CENTER);        float textLength = paint.measureText(text);        int width = (int) textLength*2;        int height = (int) (textSize*dpi*2);        Bitmap newb = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        Canvas cv = new Canvas(newb);        cv.drawColor(Color.parseColor("#00000000"));        cv.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG                | Paint.FILTER_BITMAP_FLAG));        float x=width*3/4;        float y=height/2-textSize/2;        switch (horizontalAlignment){            case LEFT:                x=width/4;                break;            case CENTER:                x=width/2;                break;            case RIGHT:                x=width*3/4;                break;        }        switch (verticalAlignment){            case TOP:                y=height/2-textSize/2;                break;            case CENTER:                y=height*3/4-textSize/2;                break;            case BOTTOM:                y=height-textSize/2;                break;        }        cv.drawText(text, x,y, paint);        cv.save(Canvas.ALL_SAVE_FLAG);// 保存        cv.restore();// 存储        return new BitmapDrawable(newb);    }}

使用

graphicsLayer.addGraphic(new Graphic(point,new CHTextSymbol(20,Color.BLUE,"HSJKF哈市将开发哈坎",this).build()));graphicsLayer.addGraphic(new Graphic(point,new CHTextSymbol(20,Color.BLUE,"HSJKF哈市将开发哈坎",this).build(CHTextSymbol.LEFT,CHTextSymbol.BOTTOM)));

build中可以设置文字的位置，默认是右上角。