Question

嗨所以我目前正在搞乱android / Java代码。我正在处理的小程序随机选择并显示图像。这很好用，但现在我要做的是将某些图像链接到一个按钮。

例如，如果从绘图中显示猫的图片，则按下猫按钮然后将选择下一个随机图像，并且如果狗的图像然后狗按钮将是唯一正确的输入那么明智。如果按下了错误的按钮，程序将通过屏幕进入游戏。

目前我已经设置了代码，所以如果显示就开始随机图像，按下按钮无论图像是什么，它都会加载下一个。这是我到目前为止使用的部分代码：

    image = (ImageView) findViewById(R.id.Hold_Image);



        Random rand = new Random();
        int rndN = rand.nextInt(16)+ 1 ; 
        String imgName = "img" + rndN;
        int id = getResources().getIdentifier(imgName, "drawable", getPackageName());  
        image.setImageResource(id); //creating the random selector
        cat = (Button) findViewById(R.id.Cat);
        dog = (Button) findViewById(R.id.Dog);//button setup
                setButtonOnClickListeners();
    }


    private void setButtonOnClickListeners(){//button code

        cat.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View arg0) {
            if(???){//what should call the image number?    
                Random rand = new Random();
                int rndN = rand.nextInt(16)+ 1 ;  
                String imgName = "img" + rndN;
                int id = getResources().getIdentifier(imgName, "drawable", getPackageName()); }//next random image upon correct button 
                Word.setImageResource(id);
                else{
//game over screen code(yet to write)
} 
            }
        });

}

Update1：这是我尝试使用Vlads方法的代码。我遇到的问题是按钮没有做任何事情，随机图像也不起作用（每次只显示一张相同的图像）

import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity1 extends Activity {
ImageView Word;
Button cat;
Button dog;
int max = 16;
int score = 0;
String imgName;
Random rand = new Random();
    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Random rand = new Random();
        setContentView(R.layout.activity_main_activity1);
        Word = (ImageView) findViewById(R.id.colour);
        cat = (Button) findViewById(R.id.theCat);
        dog = (Button) findViewById(R.id.theDog);   

            int rndN = rand.nextInt(16)+ 1 ; 
            String imgName = "cat" + rndN;
            int id = getResources().getIdentifier(imgName, "drawable", getPackageName());
            if (id == 0) {
                imgName = "dog" + rndN;
                id = getResources().getIdentifier(imgName, "drawable", getPackageName());
                Word.setImageResource(id);
            }
    }
    private void nextImage() {

        int rndN = rand.nextInt(16)+ 1 ; 
        String imgName = "cat" + rndN;
        int id = getResources().getIdentifier(imgName, "drawable", getPackageName());
        if (id == 0) {
            imgName = "dog" + rndN;
            id = getResources().getIdentifier(imgName, "drawable", getPackageName());
        }
        setButtonOnClickListeners();
      Word.setImageResource(id);
    }

    private void setButtonOnClickListeners(){
            cat= (Button) findViewById(R.id.theCat);
                cat.setOnClickListener(new OnClickListener(){

                    @Override
                    public void onClick(View buttonClicked) {

                        if(imgName.startsWith("dog") && buttonClicked.getId() == R.id.theCat ||
                                imgName.startsWith("cat") && buttonClicked.getId() == R.id.theDog) {    
                            nextImage();
                        } else {
                            //game over screen code(yet to write)
                        } 

                    }

                });}


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main_activity1, menu);
        return true;

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Answer 1

首先，给不同类型的图像添加不同的名称，例如所有狗图片dog1，dog2，...以及所有猫图片cat3，cat4，... 确保数字保持不变即可。然后将imgName定义为类变量并添加此方法：替换行＆＃34; String imgName =＆＃34; img＆＃34; + rndN;＆＃34;有了这个：

private void nextImage() {
    Random rand = new Random();
    int rndN = rand.nextInt(16)+ 1 ; 
    String imgName = "dog" + rndN;
    int id = getResources().getIdentifier(imgName, "drawable", getPackageName());
    if (id == 0) {
        imgName = "cat" + rndN;
        id = getResources().getIdentifier(imgName, "drawable", getPackageName());
    }
    image.setImageResource(id);
}

现在用这个替换你的onClick方法：

@Override
public void onClick(View v) {
    if(imgName.startsWith("dog") && v.getId() == R.id.Dog ||
            imgName.startsWith("cat") && v.getId() == R.id.Cat) {    
        nextImage();
    } else {
        //game over screen code(yet to write)
    } 
}

而且，显然，也替换了＆＃34; image = ...＆＃34;之间的部分。和＆＃34; cat = ...＆＃34; with nextImage（）。

Android：链接到某些按钮的随机图像？

}

1 个答案: