//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();

 

在BaseActivity 里面写一个方法，显示 Toast

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() ;     }