Android 之 bitmap保存为本地png图片

小咪咪 2023-09-27 17:10 26阅读 0赞

## Android 之 把bitmap保存为本地png图片 ##

#### 调用代码 ####

Bitmap bitmap = Bitmap.createBitmap(720, 1280, Bitmap.Config.ARGB_8888);
                    Canvas canvas = new Canvas(bitmap);
    //                canvas.drawColor(Color.GREEN);
    //                paint.setColor(Color.WHITE);
    //                paint.setTextSize(100);
    //                Log.e(TAG, "onDrawFrame: frame=" + frame);
    //                String text = "当前帧数：" + frame++;
    //                drawTextWithCenterPoint(canvas, 720 / 2, 1280 / 2, text, paint);
    //                canvas.drawText(text, 0, 100, paint);
                    //图片保存本地
                    String fileDir = Environment.getExternalStorageDirectory() + "/111/aaa/";
                    String fileName = "ksxy-" + System.currentTimeMillis() + ".png";
                    String path = fileDir + fileName;
                    if (!new File(fileDir).exists()) {
                        new File(fileDir).mkdirs();
                    }
                    BitmapUtils.bitmap2Path(bitmap, path);

#### 工具类： ####

import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.util.Log;
    
    import java.io.FileOutputStream;
    import java.io.OutputStream;
    
    public class BitmapUtils {
        /**
         * 文字生成图片
         * @param text
         * @param textSize
         * @param textColor
         * @param bgColor
         * @param padding
         * @return
         */
        public static Bitmap text2Bitmap(String text, int textSize, String textColor, String bgColor, int padding) {
    
            Paint paint = new Paint();
            paint.setColor(Color.parseColor(textColor));
            paint.setTextSize(textSize);
            paint.setStyle(Paint.Style.FILL);
            paint.setAntiAlias(true);
    
            float width = paint.measureText(text, 0, text.length());
    
            float top = paint.getFontMetrics().top;
            float bottom = paint.getFontMetrics().bottom;
    
            Bitmap bm = Bitmap.createBitmap((int) (width + padding * 2), (int) ((bottom - top) + padding * 2), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bm);
    
            canvas.drawColor(Color.parseColor(bgColor));
            canvas.drawText(text, padding, - top + padding, paint);
            return bm;
        }
    
        /**
         * 将bitmap转换为本地的图片
         *
         * @param bitmap
         * @return
         */
        public static String bitmap2Path(Bitmap bitmap, String path) {
            try {
                OutputStream os = new FileOutputStream(path);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
                os.flush();
                os.close();
            } catch (Exception e) {
                Log.e("TAG", "", e);
            }
            return path;
        }
    
    }