移植MonkeyRunner的圖片對比和獲取子圖功能的實現-UiAutomator/Robotium篇

轉載地址：http://blog.csdn.net/zhubaitian/article/details/41039147

根據前一篇文章《移植MonkeyRunner的圖片對比和獲取子圖功能的實現-Appium篇》所述，因爲Appium和MonkeyRunner有一個共同點--代碼控制流程都是在客戶端實現的。所以要把MonkeyRunner在PC端實現的圖片比對和獲取子圖功能移植到同樣是在PC端運行的Appium是很容易的事情，但是對於在服務器端運行的Robotium和UiAutomator就是另外一回事了。

因爲在Android的sdk中，MonkeyRunner獲取子圖和圖片比對需要用到的以下兩個類是沒有支持的，簡單來說就是java.awt這個庫是不支持的：

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;

但是在Android的sdk中有Bitmap這個類來幫助我們完成類似的功能，同時這個類還提供了一個sameAs的方法來比對兩個Bitmap是否一致，但是遺憾的是它沒有像MonkeyRunner一樣提供一個百分比來指明兩個圖片的差異接受程度，所以爲了兼容多種情況，我們需要對sameAs方法提供多個重載方法。

當然，這只是驗證代碼，有bug的話自己調吧。

1. 移植代碼

注意一下代碼只在UiAutomator上面測試通過，但是我相信Robotium是一樣的，因爲他們都是運行在目標安卓機器上面的，大家可以自行驗證下。

package libs;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class Util {

    public static boolean sameAs (String path1, String path2) throws FileNotFoundException {
        boolean res = false;
        FileInputStream fis1 = new FileInputStream(path1);
        Bitmap bitmap1  = BitmapFactory.decodeStream(fis1);

        FileInputStream fis2 = new FileInputStream(path2);
        Bitmap bitmap2  = BitmapFactory.decodeStream(fis2);

        res = sameAs(bitmap1,bitmap2);

        return res;

    }

    public static boolean sameAs (String path1, String path2,double percent) throws FileNotFoundException {
        FileInputStream fis1 = new FileInputStream(path1);
        Bitmap bitmap1  = BitmapFactory.decodeStream(fis1);

        FileInputStream fis2 = new FileInputStream(path2);
        Bitmap bitmap2  = BitmapFactory.decodeStream(fis2);

        return sameAs(bitmap1,bitmap2,percent);

    }

    public static boolean sameAs (Bitmap bitmap1, Bitmap bitmap2, double percent) {
        if(bitmap1.getHeight() != bitmap2.getHeight())
            return false;

        if(bitmap1.getWidth() != bitmap2.getWidth())
            return false;

        if(bitmap1.getConfig() != bitmap2.getConfig())
            return false;

        int width = bitmap1.getWidth();
        int height = bitmap2.getHeight();

        int numDiffPixels = 0;

         for (int y = 0; y < height; y++) {
           for (int x = 0; x < width; x++) {
             if (bitmap1.getPixel(x, y) != bitmap2.getPixel(x, y)) {
               numDiffPixels++;
             }
           }
         }
         double numberPixels = height * width;
         double diffPercent = numDiffPixels / numberPixels;
         return percent <= 1.0D - diffPercent;
    }

    public static boolean sameAs (Bitmap bmp1, Bitmap bmp2) throws FileNotFoundException {
        boolean res = false;

        res = bmp1.sameAs(bmp2);

        return res;
    }

    public static Bitmap getSubImage(String path,int x,int y,int width,int height) throws FileNotFoundException {

        FileInputStream fis = new FileInputStream(path);
        Bitmap bitmap  = BitmapFactory.decodeStream(fis);

        Bitmap res = Bitmap.createBitmap(bitmap, x, y, width, height);

        return res;

    }
}

2. 調用代碼示例

以下是UiAutomator示例，Robotium的示例請大家自行實現.

package sample.demo;

import java.io.File;
import java.io.IOException;
import libs.Util;
import android.graphics.Bitmap;

import com.android.uiautomator.core.UiDevice;
import com.android.uiautomator.core.UiObject;
import com.android.uiautomator.core.UiObjectNotFoundException;
import com.android.uiautomator.core.UiSelector;
import com.android.uiautomator.testrunner.UiAutomatorTestCase;

public class CompareScreenshots extends UiAutomatorTestCase   {

    public void testCompareScreenshotsNSubScrenshots() throws UiObjectNotFoundException, IOException, InterruptedException {
        UiDevice device = getUiDevice();
        //device.pressHome();
        UiObject appNotes = new UiObject(new UiSelector().text("Notes"));
        appNotes.click();
        Thread.sleep(3000);

        String p1 = "/data/local/tmp/1.bmp";
        String p2 = "/data/local/tmp/2.bmp";
        File f1 = new File(p1);
        if(f1.exists())
            f1.delete();

        File f2 = new File(p2);
        if(f2.exists())
            f2.delete();

        device.takeScreenshot(f1);
        device.takeScreenshot(f2);

        Bitmap sub1 = Util.getSubImage(p1, 6, 39, 474, 38);
        Bitmap sub2 = Util.getSubImage(p2, 6, 39, 474, 38);

        boolean same = Util.sameAs(sub1, sub2, 1.0);
        assertTrue(same);

        same = Util.sameAs(p1, p2, 0.9);
        assertTrue(same);



    }
}