Question

public class ImageProcActivity extends Activity {

    Button btnBrowser, btnOriginal, btnGray, btnInvert;
    TextView tv;
    ImageView iv;
    static final int ActID =1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image_proc);

        btnBrowser = (Button)findViewById(R.id.btn_gallery);
        btnOriginal = (Button)findViewById(R.id.btn_original);
        btnGray = (Button)findViewById(R.id.btn_gray);
        btnInvert = (Button)findViewById(R.id.btn_invert);
        iv = (ImageView)findViewById(R.id.iv);
        tv = (TextView)findViewById(R.id.tv);

        ImageView image;

        btnBrowser.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                Intent intentIG = new Intent(Intent.ACTION_GET_CONTENT);
                intentIG.setType("image/*");
                ImageProcActivity.this.startActivityForResult(intentIG, ActID);
            }

        });
        btnOriginal.setOnClickListener(new View.OnClickListener(){
            @Override 
            public void onClick(View v){
                //iv.setImageURI(onActivityResult.uri);
                //iv.setImageURI(OnActivityResultListener(intentIG,ActID));

//我不知道如何在这里使用浏览器中的图像。不能定义为变量......我怎样才能得到它？

            }
        });



        btnGray.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

//还有如何让图像变灰？我研究了几个代码但不明白。你能不能用简单的方式解释我几周前就开始学习JAVA ......

            }
        });

        btnInvert.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){

            }
        });

    }


    @Override
    public void onActivityResult(int activityID, int resultCode, Intent intent) {
        if(activityID==ActID && resultCode==Activity.RESULT_OK) {
            Uri uri = intent.getData();
            tv.setText(uri.toString());
            iv.setImageURI(uri);            
        }
    }
}

Answer 1

我认为你是新来的，所以你在格式化你的问题时遇到了一些问题。

顺便说一句，你可以使用下面的代码片段将图像转换为灰度，如果你有任何进一步的混淆，请告诉我：

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
public class GrayScale {
   BufferedImage  image;
   int width;
   int height;
   public GrayScale() {
      try {
         File input = new File("digital_image_processing.jpg");
         image = ImageIO.read(input);
         width = image.getWidth();
         height = image.getHeight();
         for(int i=0; i<height; i++){
            for(int j=0; j<width; j++){
               Color c = new Color(image.getRGB(j, i));
               int red = (int)(c.getRed() * 0.299);
               int green = (int)(c.getGreen() * 0.587);
               int blue = (int)(c.getBlue() *0.114);
               Color newColor = new Color(red+green+blue,
               red+green+blue,red+green+blue);
               image.setRGB(j,i,newColor.getRGB());
               }
          }
         File ouptut = new File("grayscale.jpg");
         ImageIO.write(image, "jpg", ouptut);
      } catch (Exception e) {}
   }
   static public void main(String args[]) throws Exception 
   {
      GrayScale obj = new GrayScale();
   }
}

如何使用从SD卡浏览的图像以及之后如何将其设为灰色或隐藏状态？

1 个答案: