Question

hii，在我的Android应用程序中，drawable文件夹中有许多图像。在我的布局中有两个按钮：后退和前进按钮。单击下一个和后退按钮不同 - 2图像加载在相同的布局上（所有图像通用）。问题：我能够在下一个/后退按钮点击中加载图像但是在到达最后一个图像后我想要使我的下一个按钮单击禁用并且后退按钮相同。当用户在第一个图像后退按钮将被禁用.Code为：

public class SequencerActivity extends Activity implements OnClickListener

{ private int imageCounter = 0; 私人ImageView imageLoader;

private int[] imageList = {R.drawable.image_wo_lbl_0, R.drawable.image_wo_lbl_1, R.drawable.image_wo_lbl_2, R.drawable.image_wo_lbl_3, R.drawable.image_wo_lbl_4, R.drawable.image_wo_lbl_5,
        R.drawable.image_wo_lbl_6, R.drawable.image_wo_lbl_8, R.drawable.image_wo_lbl_9,R.drawable.image_wo_lbl_10, R.drawable.image_wo_lbl_11};
@Override
public void onCreate(Bundle savedInstanceState) 
{
    setContentView(R.layout.parent_frame);//this one is the common parent layout for all image views
    super.onCreate(savedInstanceState);

    /*requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);*/

    //int image1 = R.drawable.image_w_lbl_0;

    imageLoader = (ImageView) findViewById(R.id.imageLoader);
    //imageLoader.setImageResource(image1);

    ImageButton next = (ImageButton) findViewById(R.id.next);
    ImageButton back = (ImageButton) findViewById(R.id.back);
    next.setOnClickListener(this);
    back.setOnClickListener(this);
    //show the default image
    this.loadImage(imageList[imageCounter]);

}
@Override
public void onClick(View v) 
{
    int imagePath = 0;
    // TODO Auto-generated method stub
    switch (v.getId())
    {
    case R.id.next:
        Log.i("Tag","tag");
        if(imageCounter < imageList.length)
        {
            imageCounter++;
            imagePath = imageList[imageCounter];
            if (imageCounter==(imageList.length)-1)
            {
                //**how to make my next button disable for last image**
            }
        }
        break;
    case R.id.back:
        if(imageCounter > 0)
        {
            imageCounter--;
            imagePath = imageList[imageCounter];
            if (imageCounter==0)
            {
                //**how to make my back button disable for 1st image**
            }
        }
        break;
    }
    this.loadImage(imagePath);

}

private void loadImage(int imagePath)
{
    imageLoader.setImageResource(imagePath);

}

}

请帮忙。谢谢。

Answer 1

当你有onClick事件后，忘记减少你的计数器

case R.id.back:
        if(imageCounter > 0)
        {
            imageCounter --;
            imagePath = imageList[imageCounter];
        }
        break;
    }

没有它你总是加载相同的图像

点击后退按钮加载图像的问题

1 个答案: