安卓--Toast

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.first_layout);

Button button1 = (Button) findViewById(R.id.button_1);

button1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Toast.makeText(FirstActivity.this, "You clicked Button 1",

  Toast.LENGTH_SHORT).show();

}

});

}

 <Button 

        android:id="@+id/button_1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Button 1"

        />

安卓--Toast

原文：http://www.cnblogs.com/my-time/p/4573626.html