Question

enter code here



public class MainActivity extends Activity {

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

        Button button1;
        final ImageView image;

        button1 = (Button) findViewById(R.id.button1);
        image = (ImageView) findViewById(R.id.imageView1);


        button1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                for (int j = 1; j < 6; j++) {
                    int res=getResources().getIdentifier("d002_p00"+j,  "drawable",getPackageName());
                    image.setBackgroundResource(res);
                    }
            }
        });


    }

}

我有6张图片，但这段代码只显示我的第一张和最后一张图片。它显示没有错误我该怎么办？我怎么解决它？

Answer 1

您的代码仅显示第一张和最后一张图片，因为点击监听器中的循环会遍历所有图片，而不会停止并刷新UI。如果您希望每次单击时更改图像，则应添加计数器并在每次单击时增加，而不是一次单击6次。

public class MainActivity extends Activity {
int img=0;

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

    Button button1;
    final ImageView image;

    button1 = (Button) findViewById(R.id.button1);
    image = (ImageView) findViewById(R.id.imageView1);


    button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            img++;
            img%=6;
            int res=getResources().getIdentifier("d002_p00"+img,  "drawable",getPackageName());
            image.setBackgroundResource(res);
        }
    });


}

}

Answer 2

将所有图片放入可绘制的文件夹中。

  public class MainActivityextends Activity {
int counter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button button1;
    final ImageView image;
    counter = 0;
    button1 = (Button) findViewById(R.id.button1);
    image = (ImageView) findViewById(R.id.imageView1);

    button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {

            counter++;
            counter%=6;
            if(counter==0)
            {
                image.setBackgroundResource(R.drawable.image1); 
            }
            else if (counter == 1)
            {
                image.setBackgroundResource(R.drawable.image2); 
            }
            else if (counter == 2)
            {
                image.setBackgroundResource(R.drawable.image2); 
            }
            else if (counter == 3)
            {
                image.setBackgroundResource(R.drawable.image2); 
            }
            else if (counter == 4)
            {
                image.setBackgroundResource(R.drawable.image2); 
            }
            else if (counter == 5)
            {
                image.setBackgroundResource(R.drawable.image2); 
            }

        }
    });

}
}

Answer 3

像这样改变你的循环......但我没有检查它。

//Declare this in global
 count=1



  button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
           if(count>6)
               count=1;

            int res=getResources().getIdentifier("d002_p00"+count,  "drawable",getPackageName());
            image.setBackgroundResource(res);
            count=count+1;


        }
    });

按下按钮从Drawable文件夹数组中设置图像背景

3 个答案: