書中網頁,很顯然國内是進不去的,國内的朋友應通路:https://developer.android.google.cn/reference/android/widget/Toast.html#setGravity(int,%20int,%20int)
以書中的mFalseButton為例子:
mFalseButton=(Button)findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast toast=Toast.makeText(MainActivity.this, R.string.incorrect_toast, Toast.LENGTH_SHORT);
//聲明 Toast對象,應為要 調用 setGravity 與 show函數
toast.setGravity(Gravity.TOP,0,0);
toast.show();
}
});