Button响应的两种方法

1.implement buttonlistener;

package carrot.android.pr.layout;

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

public class newlayout extends Activity 
implements View.OnClickListener {
private Button btn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(Button)findViewById(R.id.Button01);
   btn.setOnClickListener(this);
   btn.setText(new Date().toString());
    }

@Override
public void onClick(View v) {
   // TODO Auto-generated method stub
   btn.setText(new Date().toString());
}
}

 

 

2.xml

<Button android:text="@+id/Button01" 
android:id="@+id/Button01" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:onClick="@string/buttonhanlder"></Button>

<string name="buttonhanlder">myClick</string>

 

 

public class newlayout extends Activity {
private Button btn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(Button)findViewById(R.id.Button01);  
   btn.setText(new Date().toString());
    }

public void myClick(View v) {
   btn.setText(new Date().toString());
}
}