在android中的图像视图中显示矩阵

2019年8月5日 149次阅读

我正在
android中进行一些图像处理,但我在以下代码中遇到了初始问题.

public class MainActivity extends ActionBarActivity {

private Bitmap bmp; 
private int[][] rgbValues,redv,redg,redb;
public int[] nn ; 
int values,val, c;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //load the image and use the bmp object to access it  
    bmp = BitmapFactory.decodeResource(getResources(), R.drawable.capture);  

    //define the array size  
    rgbValues = new int[bmp.getWidth()][bmp.getHeight()];  

    //Print in LogCat's console each of one the RGB and alpha values from the 4 corners of the image  
    //Top Left  

    Log.i("Pixel Value", "Top Left pixel: " + Integer.toHexString(bmp.getPixel(0, 0)));  
    //Top Right  
    Log.i("Pixel Value", "Top Right pixel: " + Integer.toHexString(bmp.getPixel(31, 0)));  
    //Bottom Left  
    Log.i("Pixel Value", "Bottom Left pixel: " + Integer.toHexString(bmp.getPixel(0, 31)));  
    //Bottom Right  
    Log.i("Pixel Value", "Bottom Right pixel: " + Integer.toHexString(bmp.getPixel(31, 31)));  

    //get the ARGB value from each pixel of the image and store it into the array

    for(int i=0; i < bmp.getWidth(); i++)  
    {  
        for(int j=0; j < bmp.getHeight(); j++)  
        {  
            //This is a great opportunity to filter the ARGB values  
            rgbValues[i][j] = bmp.getPixel(i, j);  
             values = rgbValues[i][j];
             int rvalue = Color.red(values);
             Log.i("Pixel Value", "Red pixel: " + rvalue);
             int gvalue = Color.green(values);
             Log.i("Pixel Value", "Green pixel: " + gvalue);
             int bvalue = Color.blue(values);
             Log.i("Pixel Value", "Blue pixel " + bvalue);

        }  
    } 
    ImageView miamageview ;

    miamageview = ( ImageView) findViewById (R.id.imageView1);
    miamageview.setImageMatrix(rgbValues);

}

我想在ImageView(或任何其他视图)中将rgbValues矩阵显示为图像,但我收到了错误：

"The method setImageMatrix(Matrix) in the type ImageView is not applicable for the arguments `(int[][])`".

如何将rgbValues矩阵显示为图像？

最佳答案
ImageView.setImageMatrix()用于设置图像的平移,旋转和缩放矩阵.它不是用于设置RGB值.要设置RGB值,您应该使用
Bitmap.setPixels()或
Bitmap.createBitmap().此外,您需要将RGB值放入一维数组,而不是二维数组.不要问我为什么,这是Android API(它可能是出于速度原因).

因此,更改代码以写入1D数组：

private int[] rgbValues;

使用数组[(y * width)x]而不是数组[y] [x]或数组[x] [y]来处理1D数组,就像它是2D数组一样：

//define the array size  
rgbValues = new int[bmp.getWidth() * bmp.getHeight()];  

//Print in LogCat's console each of one the RGB and alpha values from the 4 corners of the image  
//Top Left  

Log.i("Pixel Value", "Top Left pixel: " + Integer.toHexString(bmp.getPixel(0, 0)));  
//Top Right  
Log.i("Pixel Value", "Top Right pixel: " + Integer.toHexString(bmp.getPixel(31, 0)));  
//Bottom Left  
Log.i("Pixel Value", "Bottom Left pixel: " + Integer.toHexString(bmp.getPixel(0, 31)));  
//Bottom Right  
Log.i("Pixel Value", "Bottom Right pixel: " + Integer.toHexString(bmp.getPixel(31, 31)));  

//get the ARGB value from each pixel of the image and store it into the array

for(int i=0; i < bmp.getWidth(); i++)  
{  
    for(int j=0; j < bmp.getHeight(); j++)  
    {  
        //This is a great opportunity to filter the ARGB values  
        rgbValues[(j * bmp.getWidth()) + i] = bmp.getPixel(i, j);  
         values = rgbValues[(j * bmp.getWidth()) + i];
         int rvalue = Color.red(values);
         Log.i("Pixel Value", "Red pixel: " + rvalue);
         int gvalue = Color.green(values);
         Log.i("Pixel Value", "Green pixel: " + gvalue);
         int bvalue = Color.blue(values);
         Log.i("Pixel Value", "Blue pixel " + bvalue);

    }  
}

然后从这个数组创建一个Bitmap并设置为ImageView：

ImageView miamageview ;

miamageview = ( ImageView) findViewById (R.id.imageView1);

Bitmap bitmap = Bitmap.createBitmap(rgbValues, bmp.getWidth(), bmp.getHeight(), Bitmap.Config.ARGB_8888);
miamageview.setImageBitmap(bitmap);
点赞