Android拼接合并圖片生成長圖

代碼實現(xiàn)合并兩張圖片，以第一張圖片的寬度為標(biāo)準(zhǔn)，如果被合并的第二張圖片寬度和第一張不同，那么就以第一張圖片的寬度為準(zhǔn)線，對第二張圖片進行縮放。

假設(shè)根目錄的Pictures下已經(jīng)有兩張圖片zhang.jpg和phil.jpg，最終把這兩張圖片合并成zhangphil.jpg的長圖：

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) {

//以第一張圖片的寬度為標(biāo)準(zhǔn)，對第二張圖片進行縮放。

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 {

//兩張圖片寬度相等，則直接拼接。

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;

}

/**

* 保存圖片到文件File。

*

* @param src 源圖片

* @param file 要保存到的文件

* @param format 格式

* @param recycle 是否回收

* @return true 成功 false 失敗

*/

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對象是否為空。

*/

public static boolean isEmptyBitmap(Bitmap src) {

return src == null || src.getWidth() == 0 || src.getHeight() == 0;

}

}

合并后生成的長圖：

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