android Button控件的四种不同方法

1.使用setOnClickListener方法监听按钮消息

package Button.bt;

import java.security.PublicKey;

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

public class ButtonActivity extends Activity {
private Button myButton;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.mButton);
myButton.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
}
});
}

2. 以内部类的形式构建按钮的监听器

package Button.bt;

import java.security.PublicKey;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ButtonActivity extends Activity {
private Button myButton;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.mButton);

}

// 自定义myButton类，对按钮消息监听，内部类可以使用外部类的变量
class myButtonListener implements OnClickListener
{
public void onClick(View v)
{
// TODO Auto-generated method stub
}
}
}

3. 在xml布局文件中的代码如下：

<Button
android:id= "@+id/mButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button"
android:onClick="bt" //关键是这句
></Button>

java代码：

package Button.bt;

import java.security.PublicKey;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ButtonActivity extends Activity {
private Button myButton;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.mButton);

}
public void bt(View myButton)
{
// TODO Auto-generated method stub
}

}

4.仔细观察后会发现，这种方法和第二种其实很相似。

package Button.bt;

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

public class ButtonActivity extends Activity {
private Button myButton;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.mButton);
myButton.setOnClickListener (mListener);
}
Button.OnClickListener mListener = new Button.OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
}
};

}

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