android图片上水印字体颜色,Android给图片添加文字和水印

话不多说上图

gif5新文件.gif

public class ImageUtil {

/**

* 设置水印图片在左上角

* @param context 上下文

* @param src

* @param watermark

* @param paddingLeft

* @param paddingTop

* @return

public static Bitmap createWaterMaskLeftTop(Context context, Bitmap src, Bitmap watermark, int paddingLeft, int paddingTop) {

return createWaterMaskBitmap(src, watermark,

dp2px(context, paddingLeft), dp2px(context, paddingTop));

}

private static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark, int paddingLeft, int paddingTop) {

if (src == null) {

return null;

}

int width = src.getWidth();

int height = src.getHeight();

//创建一个bitmap

Bitmap newb = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图

//将该图片作为画布

Canvas canvas = new Canvas(newb);

//在画布 0，0坐标上开始绘制原始图片

canvas.drawBitmap(src, 0, 0, null);

//在画布上绘制水印图片

canvas.drawBitmap(watermark, paddingLeft, paddingTop, null);

// 保存

canvas.save(Canvas.ALL_SAVE_FLAG);

// 存储

canvas.restore();

return newb;

}

/**

* 设置水印图片在右下角

* @param context 上下文

* @param src

* @param watermark

* @param paddingRight

* @param paddingBottom

* @return

public static Bitmap createWaterMaskRightBottom(Context context, Bitmap src, Bitmap watermark, int paddingRight, int paddingBottom) {

return createWaterMaskBitmap(src, watermark,

src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight),

src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));

}

/**

* 设置水印图片到右上角

* @param context

* @param src

* @param watermark

* @param paddingRight

* @param paddingTop

* @return

public static Bitmap createWaterMaskRightTop(Context context, Bitmap src, Bitmap watermark, int paddingRight, int paddingTop) {

return createWaterMaskBitmap(src, watermark,

src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight),

dp2px(context, paddingTop));

}

/**

* 设置水印图片到左下角

* @param context

* @param src

* @param watermark

* @param paddingLeft

* @param paddingBottom

* @return

public static Bitmap createWaterMaskLeftBottom(Context context, Bitmap src, Bitmap watermark, int paddingLeft, int paddingBottom) {

return createWaterMaskBitmap(src, watermark, dp2px(context, paddingLeft),

src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));

}

/**

* 设置水印图片到中间

* @param src

* @param watermark

* @return

public static Bitmap createWaterMaskCenter(Bitmap src, Bitmap watermark) {

return createWaterMaskBitmap(src, watermark,

(src.getWidth() - watermark.getWidth()) / 2,

(src.getHeight() - watermark.getHeight()) / 2);

}

/**

* 给图片添加文字到左上角

* @param context

* @param bitmap

* @param text

* @return

public static Bitmap drawTextToLeftTop(Context context, Bitmap bitmap, String text, int size, int color, int paddingLeft, int paddingTop) {

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(color);

paint.setTextSize(dp2px(context, size));

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

return drawTextToBitmap(context, bitmap, text, paint, bounds,

dp2px(context, paddingLeft),

dp2px(context, paddingTop) + bounds.height());

}

/**

* 绘制文字到右下角

* @param context

* @param bitmap

* @param text

* @param size

* @param color

* @return

public static Bitmap drawTextToRightBottom(Context context, Bitmap bitmap, String text, int size, int color, int paddingRight, int paddingBottom) {

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(color);

paint.setTextSize(dp2px(context, size));

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

return drawTextToBitmap(context, bitmap, text, paint, bounds,

bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight),

bitmap.getHeight() - dp2px(context, paddingBottom));

}

/**

* 绘制文字到右上方

* @param context

* @param bitmap

* @param text

* @param size

* @param color

* @param paddingRight

* @param paddingTop

* @return

public static Bitmap drawTextToRightTop(Context context, Bitmap bitmap, String text, int size, int color, int paddingRight, int paddingTop) {

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(color);

paint.setTextSize(dp2px(context, size));

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

return drawTextToBitmap(context, bitmap, text, paint, bounds,

bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight),

dp2px(context, paddingTop) + bounds.height());

}

/**

* 绘制文字到左下方

* @param context

* @param bitmap

* @param text

* @param size

* @param color

* @param paddingLeft

* @param paddingBottom

* @return

public static Bitmap drawTextToLeftBottom(Context context, Bitmap bitmap, String text, int size, int color, int paddingLeft, int paddingBottom) {

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(color);

paint.setTextSize(dp2px(context, size));

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

return drawTextToBitmap(context, bitmap, text, paint, bounds,

dp2px(context, paddingLeft),

bitmap.getHeight() - dp2px(context, paddingBottom));

}

/**

* 绘制文字到中间

* @param context

* @param bitmap

* @param text

* @param size

* @param color

* @return

public static Bitmap drawTextToCenter(Context context, Bitmap bitmap, String text, int size, int color) {

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(color);

paint.setTextSize(dp2px(context, size));

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

return drawTextToBitmap(context, bitmap, text, paint, bounds,

(bitmap.getWidth() - bounds.width()) / 2,

(bitmap.getHeight() + bounds.height()) / 2);

}

//图片上绘制文字

private static Bitmap drawTextToBitmap(Context context, Bitmap bitmap, String text, Paint paint, Rect bounds, int paddingLeft, int paddingTop) {

android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();

paint.setDither(true); // 获取跟清晰的图像采样

paint.setFilterBitmap(true);// 过滤一些

if (bitmapConfig == null) {

bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;

}

bitmap = bitmap.copy(bitmapConfig, true);

Canvas canvas = new Canvas(bitmap);

canvas.drawText(text, paddingLeft, paddingTop, paint);

return bitmap;

}

/**

* 缩放图片

* @param src

* @param w

* @param h

* @return

public static Bitmap scaleWithWH(Bitmap src, double w, double h) {

if (w == 0 || h == 0 || src == null) {

return src;

} else {

// 记录src的宽高

int width = src.getWidth();

int height = src.getHeight();

// 创建一个matrix容器

Matrix matrix = new Matrix();

// 计算缩放比例

float scaleWidth = (float) (w / width);

float scaleHeight = (float) (h / height);

// 开始缩放

matrix.postScale(scaleWidth, scaleHeight);

// 创建缩放后的图片

return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);

}

/**

* dip转pix

* @param context

* @param dp

* @return

public static int dp2px(Context context, float dp) {

final float scale = context.getResources().getDisplayMetrics().density;

return (int) (dp * scale + 0.5f);

}

在Activity中获取到ImageView对象，并且获取Bitmap对象，对Bitmap进行canva绘图，添加水印

public class MainActivity extends AppCompatActivity {

private ImageView mSourImage;

private ImageView mWartermarkImage;

private ImageView mWartermarkImage2;

private ImageView mWartermarkImage3;

private ImageView mWartermarkImage4;

private ImageView mWartermarkImage5;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

}

private void initView() {

mSourImage = (ImageView) findViewById(R.id.sour_pic);

mWartermarkImage = (ImageView) findViewById(R.id.wartermark_pic);

mWartermarkImage2 = (ImageView) findViewById(R.id.wartermark_pic2);

mWartermarkImage3 = (ImageView) findViewById(R.id.wartermark_pic3);

mWartermarkImage4 = (ImageView) findViewById(R.id.wartermark_pic4);

mWartermarkImage5 = (ImageView) findViewById(R.id.wartermark_pic5);

Bitmap sourBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.sour_pic);

mSourImage.setImageBitmap(sourBitmap);

Bitmap waterBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.weixin);

Bitmap watermarkBitmap = ImageUtil.createWaterMaskCenter(sourBitmap, waterBitmap);

Bitmap watermarkBitmap2 = ImageUtil.createWaterMaskLeftBottom(this, sourBitmap, waterBitmap, 0, 0);

Bitmap watermarkBitmap3 = ImageUtil.createWaterMaskRightBottom(this, sourBitmap, waterBitmap, 0, 0);

Bitmap watermarkBitmap4 = ImageUtil.createWaterMaskLeftTop(this, sourBitmap, waterBitmap, 0, 0);

Bitmap watermarkBitmap5 = ImageUtil.createWaterMaskRightTop(this, sourBitmap, waterBitmap, 0, 0);

Bitmap textBitmap = ImageUtil.drawTextToLeftTop(this, watermarkBitmap4, "左上角", 16, Color.RED, 0, 0);

Bitmap textBitmap2 = ImageUtil.drawTextToRightBottom(this, watermarkBitmap3, "右下角", 16, Color.RED, 0, 0);

Bitmap textBitmap3 = ImageUtil.drawTextToRightTop(this, watermarkBitmap5, "右上角", 16, Color.RED, 0, 0);

Bitmap textBitmap4 = ImageUtil.drawTextToLeftBottom(this, watermarkBitmap2, "左下角", 16, Color.RED, 0, 0);

Bitmap textBitmap5 = ImageUtil.drawTextToCenter(this, watermarkBitmap, "中间", 16, Color.RED);

mWartermarkImage.setImageBitmap(textBitmap);

mWartermarkImage2.setImageBitmap(textBitmap2);

mWartermarkImage3.setImageBitmap(textBitmap3);

mWartermarkImage4.setImageBitmap(textBitmap4);

mWartermarkImage5.setImageBitmap(textBitmap5);

}

添加一个布局，上面是原始图片，下面是添加水印后的图片

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent">

android:layout_width="match_parent"