如何禁用按钮单击?

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:后退和下一步按钮。 在单击下一个和后退按钮时,2个不同的图像被加载到相同的布局上(所有图像都是通用的)。

问题 :我能够在下一个/后退按钮的点击上加载图像,但在到达最后一个图像后,我想使我的下一个按钮禁用,并且后退按钮也相同。当用户在第一张图像上时,应该禁用后退按钮。 代码如下:

public class SequencerActivity extends Activity implements OnClickListener { private int imageCounter = 0; private 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  0) { imageCounter--; imagePath = imageList[imageCounter]; if (imageCounter==0) { //how to make my back button disable } } break; } this.loadImage(imagePath); } private void loadImage(int imagePath) { imageLoader.setImageResource(imagePath); } } 

 case R.id.next: Log.i("Tag","tag"); if(imageCounter < imageList.length) { imageCounter++; imagePath = imageList[imageCounter]; if (imageCounter==(imageList.length)-1) { ImageButton next=(ImageButton)findViewBYId(R.id.next); next.setEnabled(false); } } break; case R.id.back: if(imageCounter > 0) { imageCounter--; imagePath = imageList[imageCounter]; if (imageCounter==0) { ImageButton back=(ImageButton)findViewBYId(r.id.back); back.setEnabled(false); } } break; 
 next.setClickable(false); 

更优选的解决方案是,

 onclick(){ btn.setEnabled(false); btn.setClickable(false); //yourwork myWork(); } myWork(){ //your tasks. btn.setEnabled(true); btn.setClickable(true); } 

由于链接可以轻易忽略,我不得不一次又一次地重复这一点

只需在可绘制文件夹中插入两个额外图像,一个用于禁用右箭头,另一个用于禁用左箭头。

现在尝试这个

  case R.id.next: Log.i("Tag","tag"); if(imageCounter < imageList.length) { imageCounter++; imagePath = imageList[imageCounter]; if (imageCounter==(imageList.length)-1) { //disabling right button by changing image from following code next.setImageDrawable(getResources().getDrawable(R.drawable.right_disabled)); } } break; case R.id.back: if(imageCounter > 0) { imageCounter--; imagePath = imageList[imageCounter]; if (imageCounter==0) { back.setImageDrawable(getResources().getDrawable(R.drawable.left_disabled)); } } break;