Android开发20——单个监听器监听多个按钮点击事件 推荐

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("");
}
}