android 图片合成

package com.ebensz.eink.demo;



import java.io.File;

import java.io.FileOutputStream;



import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.Bitmap.CompressFormat;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.os.Bundle;

import android.view.View;

import android.view.View.MeasureSpec;

import android.view.View.OnClickListener;

import android.widget.Button;



public class Exchange extends Activity implements OnClickListener {

    private Bitmap bitmap1;

    private Button mExportBtn;

    private static final String BITMAP_He = "/sdcard/bitmap_add.png";



    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.scrollview);



        mExportBtn = (Button) this.findViewById(R.id.export_he);

        mExportBtn.setOnClickListener(this);

    }



    @Override

    public void onClick(View v) {

        // TODO Auto-generated method stub

        switch (v.getId()) {

        case R.id.export_he:

            exportAll();

            break;

        default:

            break;

        }

    }



    /**

     * 将布局转换为View类型对象

     * @param filename

     */

    private void exportAll( ) {

        View view = getLayoutInflater().inflate(R.layout.scrollview, null);

        view.setDrawingCacheEnabled(true);

        view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),

                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        try {

            bitmap1 = view.getDrawingCache();

            heCheng(BITMAP_He);

        } catch (Exception e) {



        }

    }



    /**

     * bitmap1 考评结果图片

     * bitmap2 签字图片

     * bitmap3 带签字的考评结果

     * @param filename 生成带签字考评结果的文件路径和文件名

     */

    private void heCheng(String filename) {



        Bitmap bitmap2 = MainActivity.mbitmap;

        Bitmap bitmap3 = Bitmap.createBitmap(bitmap1.getWidth(),

                bitmap1.getHeight(), bitmap1.getConfig());

        Canvas canvas = new Canvas(bitmap3);

        canvas.drawBitmap(bitmap1, new Matrix(), null);

        canvas.drawBitmap(bitmap2, 20, 1000, null); // 120、350为bitmap2写入点的x、y坐标

        try {

            FileOutputStream out = new FileOutputStream(filename);

            bitmap3.compress(Bitmap.CompressFormat.PNG, 90, out);

            out.close();

        } catch (Exception e) {



        }

    }



}