Question

我正在制作一个改变背景颜色的程序，例如，当我按下白色，将背景改为白色，将黑色改为黑色等等......按下按钮后，其他按钮消失，我已经这样做但我想要做的是每次点击Textview按钮出现/消失。我怎样才能做到这一点？

这是我的代码

LinearLayout myLayout;
    LinearLayout myLayout2;
    // Declare UI elements
    private Button firstButton;
    private Button secondButton, thirdButton;
//    private ImageView changeBackground;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 


        myLayout = (LinearLayout) findViewById(R.id.myLayout);
        myLayout2 = (LinearLayout) findViewById(R.id.myLayout2);

        // Initialize the UI components



        firstButton = (Button) findViewById(R.id.button1); 
        // When we creating a button and if we expect that to use for event handling we have to set the listener
        firstButton.setOnClickListener(this);
        secondButton = (Button) findViewById(R.id.button2);
        secondButton.setOnClickListener(this);
        thirdButton = (Button) findViewById(R.id.button3);
        thirdButton.setOnClickListener(this);

    }



@Override
    public void onClick(View v) { // Parameter v stands for the view that was clicked.  

        switch(v.getId()) {

        case R.id.button1:
            myLayout.setBackgroundColor(Color.WHITE);
            myLayout2.setVisibility(View.INVISIBLE);
            break;

        case R.id.button2:
            myLayout.setBackgroundColor(Color.BLACK);
            myLayout2.setVisibility(View.INVISIBLE);
            break;

        case R.id.button3:
            myLayout.setBackgroundColor(Color.RED);
            myLayout2.setVisibility(View.INVISIBLE);
            break;


        }

    }

xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#A9F5F2"
    android:id="@+id/myLayout"
    tools:context=".MainActivity" >


    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:text="@string/hello_world" />

        <LinearLayout
             android:id="@+id/myLayout2"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:background="#D8D8D8"
             android:orientation="horizontal"
             android:gravity="center"
             tools:context=".MainActivity" >

            <Button
                android:id="@+id/button1"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"        
                android:text="@string/white" />



            <Button
                android:id="@+id/button2"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBaseline="@+id/button1"
                android:layout_alignBottom="@+id/button1"
                android:layout_toRightOf="@+id/button1"
                android:text="@string/black" />


            <Button
                android:id="@+id/button3"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBaseline="@+id/button2"
                android:layout_alignBottom="@+id/button2"
                android:layout_toRightOf="@+id/button2"
                android:text="@string/red" />
        </LinearLayout>
</LinearLayout>

Answer 1

如果您希望按钮消失并具有所有特性，请使用：

 myLayout2.setVisibility(View.GONE);

而不是

 myLayout2.setVisibility(View.INVISIBLE);

不可见：

 This view is invisible, but it still takes up space for layout purposes.

GONE：

 This view is invisible, and it doesn't take any space for layout purposes.

Answer 2

试试这个

myLayout.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v){
               myLayout2.setVisibility(View.VISIBLE);
            }
        });

并改变这一点：

myLayout2.setVisibility(View.INVISIBLE);

为：

 myLayout2.setVisibility(View.GONE);

只是为了解释为什么你需要使用GONE而不是INVISIBLE，如果你将可见性设置为INVISIBLE，对象将继续改变为存在于屏幕中，你只是看不到对象......当你使用时GONE对象在屏幕上不存在但存在于app实例中。

如何点击Textview按钮出现/消失？

2 个答案: