package com.yanyv.myfirstapp;
import android.app.*;
import android.os.*;
import android.widget.*;
import android.view.View.*;
import android.view.*;
public class MainActivity extends Activity
{
Button B;
@Override
public void onCreate(Bundle savedInstanceState)
{
// TODO: Implement this method
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
B = (Button)findViewById(R.id.mainButton1_1);
B.setOnClickListener(new OnClickListener(){
@Override
public void onClick (View p1)
{
Toast.makeText(getApplicationContext(),
"输出文字"
Toast.LENGTH_SHORT),show();
}
private void show()
{
// TODO: Implement this method
}
});
}
}

Toast.makeText(MainActivity.this,"文字",Toast.LENGTH_SHORT).show();

Toast，no悬浮窗