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一、单个按钮点击事件的监听
方法一
/** * 从网络上获取图片 * * @author 徐越 * */public class MainActivity extends Activity{ private EditText txtPath; private Button btnShowImage; private ImageView imgView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); txtPath = (EditText) this.findViewById(R.id.txtPath); btnShowImage = (Button) this.findViewById(R.id.btnShowImage); imgView = (ImageView) this.findViewById(R.id.imgView); btnShowImage.setOnClickListener(new ShowImageListener()); } private final class ShowImageListener implements View.OnClickListener { @Override public void onClick(View v) { // 图片路径 String path = txtPath.getText().toString(); try { // 获取图片的二进制数据 byte[] imgdata = ImageService.getImage(path); // 利用Bitmap工厂生成Bitmap Bitmap bitmap = BitmapFactory.decodeByteArray(imgdata, 0, imgdata.length); // imageView接收Bitmap并显示 imgView.setImageBitmap(bitmap); } catch (Exception e) { Toast.makeText(MainActivity.this, "读取图片失败", Toast.LENGTH_SHORT).show(); } } }}
方法二
在布局页面中给该按钮加上android:onClick="showImage"，然后再显示该元素的Activity中加入showImage(View v)的方法，在该方法中进行操作。
二、多个按钮点击事件的监听
方法一
在Activity中按照第一个大标题的方法，给每个按钮写一个监听类或者监听方法。
方法二
利用一个监听器监听所有按钮的点击事件
/** * 查询号码归属地 * * @author 徐越 * */public class MainActivity extends Activity implements View.OnClickListener{ private EditText txtPhone; private TextView lblAddress; private Button btnQuery; private Button btnReset; private CallAddressQueryService callAddressQueryService = new CallAddressQueryService(); private final int CLICK_QUERY = 1; private final int CLICK_RESET = 2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lblAddress = (TextView) this.findViewById(R.id.lblAddress); txtPhone = (EditText) this.findViewById(R.id.txtPhone); btnQuery = (Button) this.findViewById(R.id.btnQuery); btnReset = (Button) this.findViewById(R.id.btnReset); btnQuery.setOnClickListener(this); btnQuery.setTag(CLICK_QUERY); btnReset.setOnClickListener(this); btnReset.setTag(CLICK_RESET); } @Override public void onClick(View v) { int tag = (Integer) v.getTag(); switch (tag) { case CLICK_QUERY: query(); break; case CLICK_RESET: reset(); break; } } public void query() { String phone = txtPhone.getText().toString(); try { lblAddress.setText("查询中"); String address = callAddressQueryService.getCallAddress(phone); lblAddress.setText(address); } catch (Exception e) { e.printStackTrace(); Toast.makeText(this, "查询失败", Toast.LENGTH_LONG).show(); } } public void reset() { txtPhone.setText(""); lblAddress.setText(""); }}给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
