android 为图片打上水印
说起水印其实很简单,就是在一张图片上面画上另一张图片或文字
实现如下:
- package com.tang.watermark;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.graphics.Canvas;
- import android.graphics.PixelFormat;
- import android.graphics.Bitmap.Config;
- import android.graphics.drawable.BitmapDrawable;
- import android.graphics.drawable.Drawable;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.ImageView;
- public class MainActivity extends Activity {
- ImageView imageView;
- Bitmap mark;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- imageView = (ImageView) findViewById(R.id.imageView1);
- imageView.setImageResource(R.drawable.heihei);
- mark = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
- Button button = (Button) findViewById(R.id.button1);
- button.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Bitmap temp = watermark(drawableToBitmap(imageView.getDrawable()),mark,50,100);
- imageView.setImageBitmap(temp);
- }
- });
- }
- /**
- * 将bitmap转换为Drawable
- * @param bitmap
- * @return
- */
- public static Drawable bitmapToDrawable(Bitmap bitmap)
- {
- BitmapDrawable bd = new BitmapDrawable(bitmap);
- return bd;
- }
- /**
- * @param src
- * @param bg
- * @param color
- * @return
- */
- public static Bitmap watermark(Bitmap src,Bitmap mark,int x,int y)
- {
- int w = src.getWidth();
- int h = src.getHeight();
- Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );
- Canvas cv = new Canvas(newb);
- cv.drawBitmap(src, 0, 0, null );
- cv.drawBitmap(mark,x, y, null );
- cv.save( Canvas.ALL_SAVE_FLAG );//保存
- cv.restore();//存储
- return newb;
- }
- /**
- * Drawable 转换为Bitmap
- * @param drawable
- * @return
- */
- public static Bitmap drawableToBitmap(Drawable drawable) {
- // 取 drawable 的长宽
- int w = drawable.getIntrinsicWidth();
- int h = drawable.getIntrinsicHeight();
- // 取 drawable 的颜色格式
- Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
- : Bitmap.Config.RGB_565;
- Bitmap bitmap = Bitmap.createBitmap(w, h, config);
- Canvas canvas = new Canvas(bitmap);
- drawable.setBounds(0, 0, w, h);
- drawable.draw(canvas);
- return bitmap;
- }
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