Android 在xml布局設定檔中給Button按鈕添加事件

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在Android裡面，添加Listener，具體步驟如下：

1.首先在layout裡面定義Button並指定響應的Listener

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="<a href="http://schemas.android.com/apk/res/android"">http://schemas.android.com/apk/res/android"</a>
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<Button
    android:text="Button01"
    android:id="@+id/Button01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="myClickH1"
    />
<Button
    android:text="Button02"
    android:id="@+id/Button02"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="myClick2"
    />
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
</LinearLayout>

其中以下這兩行就是新增的特性：

android:onClick="myClick1"

android:onClick="myClick2"

2.在活動裡面定義public的方法myClick1、和myClick2

 

 

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class TestOnClickListener extends Activity {
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       

    }
    public void myClickHandler01(View v){
        setTitle("myClick1");
    }
    public void myClick2(View v){
        setTitle("myClick2");
    }
}

 

 

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class TestOnClickListener extends Activity {
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       

    }
    public void myClick1(View v){
        setTitle("myClick1");
    }
    public void myClick2(View v){
        setTitle("myClick2");
    }
}

也可以採用這種寫法，將兩個按鈕設定到同一個Listener 代碼如下所示：

android:onClick="onClick"

android:onClick="onClick"

 

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class TestOnClickListener extends Activity {
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    public void myClickHandler(View v){
         switch (v.getId()) {
         case R.id.Button01:
             setTitle("Click1");
             break;
         case R.id.Button2:
             setTitle("Click2");
             break;
         }
    }
}