Android開發之大位元影像壓縮浮水印處理

標籤：public   image   sdc   ons   android   sid   exce   config   roi   

      我們在發微博或者csdn博文的時候都能夠給圖片加上一個浮水印。一個獨立的標識，那是怎麼實現的呢？先封裝一個BitmapTools封裝類。該類要解決的問題是一將突破儲存至sdcard中，二給圖片加上浮水印。

BitmapTools

package com.example.g11_bitmap04;import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.os.Environment;public class BitmapTools {public BitmapTools() {// TODO Auto-generated constructor stub}public static Bitmap createBitmap(Resources resources, int resid,String name) {Bitmap bitmap=BitmapFactory.decodeResource(resources, resid);//複製一份新的Bitmap,由於不能直接在原有的bitmap上進行浮水印操作//Bitmap.config儲存的格式Bitmap newBitmap=bitmap.copy(Bitmap.Config.ARGB_8888, true);//使用自己定義畫布Canvas canvas=new Canvas(newBitmap);Paint paint=new Paint();paint.setTextSize(200);canvas.drawText("hello", 100, 100, paint);//推斷SDcard是否在可用狀態if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//直接將圖片儲存在根資料夾下File root=Environment.getExternalStorageDirectory();OutputStream outputStream=null;try {outputStream=new FileOutputStream(new File(root, name));//對圖片進行壓縮並以png格式，儲存在sdcard中newBitmap.compress(Bitmap.CompressFormat.PNG, 50, outputStream);} catch (Exception e) {// TODO: handle exception}}return newBitmap;}}

MainActivtiy中調用該方法

package com.example.g11_bitmap04;import android.os.Bundle;import android.app.Activity;import android.graphics.Bitmap;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity {     private ImageView imageView;     private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imageView=(ImageView)this.findViewById(R.id.imageView1);button=(Button)this.findViewById(R.id.button1);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubBitmap bitmap=BitmapTools.createBitmap(getResources(), R.drawable.a, "a.png");imageView.setImageBitmap(bitmap);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

    

Android開發之大位元影像壓縮浮水印處理