Question

我用按钮创建了一个穷人的键盘，我已经使用三行这样将它们放在TableLayout中了：

<TableLayout
android:id="@+id/TableLayout_Keyboard"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">

<TableRow
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <Button
        android:id="@+id/Keyboard_Btn_Q"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/q"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_W"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/w"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_E"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/e"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_R"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/r"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_T"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/t"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_Y"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/y"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_U"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/u"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_I"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/i"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_O"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/o"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_P"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/p"
        tools:ignore="ButtonStyle" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <Button
        android:id="@+id/Keyboard_Btn_A"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/a"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_S"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/s"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_D"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/d"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_F"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/f"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_G"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/g"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_H"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/h"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_J"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/j"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_K"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/k"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_L"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/l"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <Button
        android:id="@+id/Keyboard_Btn_Z"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/z"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_X"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/x"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_C"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/c"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_V"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/v"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_B"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/b"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_N"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/n"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />

    <Button
        android:id="@+id/Keyboard_Btn_M"
        android:layout_width="35dp"
        android:layout_height="wrap_content"
        android:onClick="keyboardButtonPressed"
        android:text="@string/m"
        android:textSize="14sp"
        tools:ignore="ButtonStyle" />
</TableRow>

现在我想制作一个以编程方式禁用所有按钮的方法。我试过这样做：

private void disableKeyboard(){
    TableLayout keyboard = (TableLayout)findViewById(R.id.TableLayout_Keyboard);

    for (int i = 0; i < keyboard.getChildCount(); i++) {
        View v = keyboard.getChildAt(i);

        if (v instanceof Button) {
            v.setEnabled(false);
        }
    }
}

但它不起作用。我以为.getChildAt()会获得TableRows，所以我这样做了：

private void disableKeyboard(){
    TableLayout keyboard = (TableLayout)findViewById(R.id.TableLayout_Keyboard);

    for (int i = 0; i < keyboard.getChildCount(); i++) {
        View v = keyboard.getChildAt(i);

        if(v instanceof TableRow) {
            for(int j=0; j < ((TableRow) v).getChildCount(); j++){
                View vv = keyboard.getChildAt(i);

                if (vv instanceof Button) {
                    vv.setEnabled(false);
                }
            }
        }
    }
}

但那也没有用。如何循环浏览所有按钮并禁用它们？

EDIT找到了解决方案：

private void disableKeyboard(){
    TableLayout keyboard = (TableLayout)findViewById(R.id.TableLayout_Keyboard);
    ArrayList<View> layoutButtons = keyboard.getTouchables();

    for(View v : layoutButtons){
        if( v instanceof Button ) {
            v.setEnabled(false);
        }
    }
}

Answer 1

我意识到禁用这些按钮会使他们无法接触＆＃34; - 意味着我们在被禁用后无法通过.getTouchables()获取它们。我想创建一个切换功能（这样我可以在启用/禁用之间切换），并且必须这样做：

private ArrayList<View> keyboardButtons;

private void storeKeyboardButtons(){
    TableLayout keyboard = (TableLayout)findViewById(R.id.TableLayout_Keyboard);
    ArrayList<View> layoutButtons = keyboard.getTouchables();

    for(View v : layoutButtons){
        if( v instanceof Button ) {
            keyboardButtons.add(v);
        }
    }
}

private void toggleKeyboard(boolean whichState){
    //whichState == true enables ALL the buttons
    //whichState == false disables ALL the buttons

    for (View v: keyboardButtons) {
        v.setEnabled(whichState);
    }
}

我首先将键盘中的所有按钮存储在名为＆＃34; keyboardButtons＆＃34;的变量中，从onCreate -method调用此方法（storeKeyboardButtons）。稍后，当我想启用或禁用按钮时，我只需调用toggleKeyboard -method并为启用传递true，为禁用传递false。

Android迭代通过TableLayout，禁用所有按钮

1 个答案: