如何在图像上绘制文本? [英] How to draw text On image?

问题描述

我想在图像上绘制文本(用于保存带有文本的图像).我有图像视图我将位图设置为该图像我想在图像上绘制文本(用户输入的文本).我在保存之前试过这个.....

I want to draw text on image ( for saving that image with text ). i have image view i set bitmap to that image i want to Draw the text on image (text entered by user ). i tried this before saving.....

void saveImage() {
    File myDir=new File("/sdcard/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
           FileOutputStream out = new FileOutputStream(file);
           originalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
           out.flush();
           out.close();

    } catch (Exception e) {
           e.printStackTrace();
    }
}

XML 代码是..

<FrameLayout 
     android:id="@+id/framelayout"
     android:layout_marginTop="30dip"
     android:layout_height="fill_parent" 
     android:layout_width="fill_parent">

     <ImageView 
          android:id="@+id/ImageView01"
          android:layout_alignParentTop="true"
          android:layout_height="wrap_content" 
          android:layout_width="wrap_content"/>

     <TextView android:id="@+id/text_view2"
          android:layout_marginTop="20dip"
          android:layout_width="wrap_content" 
          android:text="SampleText"
          android:textSize="12pt"
          android:layout_alignTop="@+id/ImageView01" 
          android:layout_height="wrap_content"/>  

</FrameLayout>

推荐答案

更新 SaveImage() 方法，支持文字绘制.

Updated SaveImage() method, to support text drawing.

void saveImage() {
    File myDir=new File("/sdcard/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
        FileOutputStream out = new FileOutputStream(file);

        // NEWLY ADDED CODE STARTS HERE [
            Canvas canvas = new Canvas(originalBitmap);

            Paint paint = new Paint();
            paint.setColor(Color.WHITE); // Text Color
            paint.setTextSize(12); // Text Size
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER)); // Text Overlapping Pattern
            // some more settings...

            canvas.drawBitmap(originalBitmap, 0, 0, paint);
            canvas.drawText("Testing...", 10, 10, paint);
        // NEWLY ADDED CODE ENDS HERE ]

        originalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    } catch (Exception e) {
       e.printStackTrace();
    }
}

告诉我这是否适合您.

沙沙

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