[英]How can i make a dynamically created Bitmap to fit an ImageView?
我想從具有給定文本大小的String
創建Bitmap
,並將其設置為ImageView
源。
ImageView
在其布局xml中:
<ImageView
android:id="@+id/myImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"/>
將Bitmap
設置為ImageView
src:
myImageView.setImageBitmap(getBitmapFromString("StringToDraw", 30));
我的getBitmapFromString
方法:
private Bitmap getBitmapFromString(String string, float textSize) {
Bitmap bitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
paint.setTextSize(textSize);
paint.setTextAlign(Paint.Align.LEFT);
canvas.drawText(string, 0, 100, paint);
return bitmap;
}
如何計算位圖的適當大小(根據給定的文本大小和String
長度),如何使其適合ImageView?
在以下類似問題的答案中找到了解決方案: https : //stackoverflow.com/a/15252876/3363481
我的代碼現在看起來像這樣:
private Bitmap getBitmapFromString(String text, float fontSizeSP, Context context) {
int fontSizePX = convertDiptoPix(context, fontSizeSP);
int pad = (fontSizePX / 9);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setTextSize(fontSizePX);
int textWidth = (int) (paint.measureText(text) + pad * 2);
int height = (int) (fontSizePX / 0.75);
Bitmap bitmap = Bitmap.createBitmap(textWidth, height, Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(bitmap);
float xOriginal = pad;
canvas.drawText(text, xOriginal, fontSizePX, paint);
return bitmap;
}
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