Android拼接合并图片生成长图

Android拼接合并图片生成长图

代码实现合并两张图片，以第一张图片的宽度为标准，如果被合并的第二张图片宽度和第一张不同，那么就以第一张图片的宽度为准线，对第二张图片进行缩放。

假设根目录的Pictures下已经有两张图片zhang.jpg和phil.jpg，最终把这两张图片合并成zhangphil.jpg的长图：

package zhangphil.test;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.os.Bundle;import android.os.Environment;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;public class JavaActivity extends AppCompatActivity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.drawable_activity);        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                merge();            }        });    }    private void merge() {        new Thread(new Runnable() {            @Override            public void run() {                File zhang = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "zhang.jpg");                File phil = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "phil.jpg");                try {                    Bitmap bitmap1 = BitmapFactory.decodeStream(new FileInputStream(zhang));                    Bitmap bitmap2 = BitmapFactory.decodeStream(new FileInputStream(phil));                    Bitmap newBmp = newBitmap(bitmap1, bitmap2);                    File zhangphil = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "zhangphil.jpg");                    if (!zhangphil.exists())                        zhangphil.createNewFile();                    save(newBmp, zhangphil, Bitmap.CompressFormat.JPEG, true);                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }    public static Bitmap newBitmap(Bitmap bmp1, Bitmap bmp2) {        Bitmap retBmp;        int width = bmp1.getWidth();        if (bmp2.getWidth() != width) {            //以第一张图片的宽度为标准，对第二张图片进行缩放。            int h2 = bmp2.getHeight() * width / bmp2.getWidth();            retBmp = Bitmap.createBitmap(width, bmp1.getHeight() + h2, Bitmap.Config.ARGB_8888);            Canvas canvas = new Canvas(retBmp);            Bitmap newSizeBmp2 = resizeBitmap(bmp2, width, h2);            canvas.drawBitmap(bmp1, 0, 0, null);            canvas.drawBitmap(newSizeBmp2, 0, bmp1.getHeight(), null);        } else {            //两张图片宽度相等，则直接拼接。                        retBmp = Bitmap.createBitmap(width, bmp1.getHeight() + bmp2.getHeight(), Bitmap.Config.ARGB_8888);            Canvas canvas = new Canvas(retBmp);            canvas.drawBitmap(bmp1, 0, 0, null);            canvas.drawBitmap(bmp2, 0, bmp1.getHeight(), null);        }        return retBmp;    }    public static Bitmap resizeBitmap(Bitmap bitmap, int newWidth, int newHeight) {        float scaleWidth = ((float) newWidth) / bitmap.getWidth();        float scaleHeight = ((float) newHeight) / bitmap.getHeight();        Matrix matrix = new Matrix();        matrix.postScale(scaleWidth, scaleHeight);        Bitmap bmpScale = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);        return bmpScale;    }    /**     * 保存图片到文件File。     *     * @param src     源图片     * @param file    要保存到的文件     * @param format  格式     * @param recycle 是否回收     * @return true 成功 false 失败     */    public static boolean save(Bitmap src, File file, Bitmap.CompressFormat format, boolean recycle) {        if (isEmptyBitmap(src))            return false;        OutputStream os;        boolean ret = false;        try {            os = new BufferedOutputStream(new FileOutputStream(file));            ret = src.compress(format, 100, os);            if (recycle && !src.isRecycled())                src.recycle();        } catch (IOException e) {            e.printStackTrace();        }        return ret;    }    /**     * Bitmap对象是否为空。     */    public static boolean isEmptyBitmap(Bitmap src) {        return src == null || src.getWidth() == 0 || src.getHeight() == 0;    }}

合并后生成的长图：

添加权限：

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