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Android開發20——單個監聽器監聽多個按鈕點擊事件
一、單個按鈕點擊事件的監聽
方法一
/**
* 從網絡上獲取圖片
*
* @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)
{
// 圖片路徑
String path = txtPath.getText().toString();
try
{
// 獲取圖片的二進製數據
byte[] imgdata = ImageService.getImage(path);
// 利用Bitmap工廠生成Bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(imgdata, 0, imgdata.length);
// imageView接收Bitmap並顯示
imgView.setImageBitmap(bitmap);
}
catch (Exception e)
{
Toast.makeText(MainActivity.this, "讀取圖片失敗", Toast.LENGTH_SHORT).show();
}
}
}
}
方法二
在布局頁麵中給該按鈕加上android:onClick="showImage"，然後再顯示該元素的Activity中加入showImage(View v)的方法，在該方法中進行操作。
二、多個按鈕點擊事件的監聽
方法一
在Activity中按照第一個大標題的方法，給每個按鈕寫一個監聽類或者監聽方法。
方法二
利用一個監聽器監聽所有按鈕的點擊事件
/**
* 查詢號碼歸屬地
*
* @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("查詢中");
String address = callAddressQueryService.getCallAddress(phone);
lblAddress.setText(address);
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(this, "查詢失敗", Toast.LENGTH_LONG).show();
}
}
public void reset()
{
txtPhone.setText("");
lblAddress.setText("");
}
}
最後更新：2017-04-04 07:03:05