Android Toast

//Toast.LENGTH_SHORT == 0
Toast.makeText( Activity1.this , "点击了" , Toast.LENGTH_SHORT ).show();
Toast.makeText( Activity1.this , "点击了" , 0 ).show();

//Toast.LENGTH_LONG == 1
Toast.makeText( Activity1.this , "点击了" , Toast.LENGTH_LONG ).show();
Toast.makeText( Activity1.this , "点击了" , 1 ).show();

private Toast toast ;

protected void showToast(String msg, int length) {
if (toast == null) {
toast = Toast.makeText(this, msg, length);
} else {
toast.setText(msg);
}
toast.show() ;
}