【转】Android开发20——单个监听器监听多个按钮点击事件

原文网址：http://woshixy.blog.51cto.com/5637578/1093936

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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("");
    }
}

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