Android开发20——单个监听器监听多个按钮点击事件

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;@Overridepublic 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{@Overridepublic 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BitmapBitmap 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;@Overridepublic 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);}@Overridepublic 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("");}}