Question

我有这个简单的代码，按下按钮时运行完美，它会反转我的图像视图的原始图像。这需要3到4秒钟。我想在任务之间添加进度条以通知用户我该怎么做？我在哪里可以添加进度条？

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_invert_image);

    mImageView = (ImageView) findViewById(R.id.myIView);

    mImageView.setImageResource(R.mipmap.myimage);
    invertButton = (Button) findViewById(R.id.invertButton);

    invertButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mImageView.buildDrawingCache();
            Bitmap image = mImageView.getDrawingCache();
            Bitmap readyImage = invertImage(image);
            mImageView.setImageBitmap(readyImage);

        }
    });
}

public Bitmap invertImage(Bitmap original){

    Bitmap finalBitmap = Bitmap.createBitmap(original.getWidth(), original.getHeight(), original.getConfig());

    int A, R, G, B, pixelColor;
    int height = original.getHeight();
    int width = original.getWidth();

    for(int x = 0; x < height; x++){
        for(int y = 0; y < width; y++){
            pixelColor = original.getPixel(y,x);
            A = Color.alpha(pixelColor);
            R = 255 - Color.red(pixelColor);
            G = 255 - Color.green(pixelColor);
            B = 255 - Color.blue(pixelColor);

            finalBitmap.setPixel(y, x, Color.argb(A,R,G,B));
        }
    }

    return finalBitmap;
}

...指导

Answer 1

你可以这样做，设置进度条，初始for循环的增量为完整循环的一部分，在这种情况下x = height。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#define FREQUENCY 5
#define MIN -10
#define MAX 35

int main()
{
    time_t t;

    /*
    * Initialize random number generator
    */
    srand((unsigned) time(&t));

    /*
    * Print random values between -10 and +35°C
    */
    while(1)
    {
            double random = ((double)rand() * (MAX-MIN))/(double)RAND_MAX+MIN;
            printf("Temperature = %1.2f @ %d\n", random, system("date"));
            fflush(stdout);
            sleep(FREQUENCY);
    }
}

来自ProgressBar文档。

private ProgressBar mProgress; // Note your will need to implement the progress bar.

public Bitmap invertImage(Bitmap original){

    .../...

    while (mProgressStatus < 100) 

        for(int x = 0; x < height; x++){
            mProgressStatus = x/height*100;
            mProgress.setProgress(mProgressStatus);
            for(int y = 0; y < width; y++){
            .../...
            finalBitmap.setPixel(y, x, Color.argb(A,R,G,B));
        }
    }

    return finalBitmap; 
}

图像反转时添加进度条

1 个答案: