Android:获取片段的背景颜色

时间:2016-05-29 11:10:05

标签: java android android-layout android-fragments

我试图通过活动的onCreate方法从片段的XML文件中获取android:background属性的颜色集。 我同时使用了getSolidColor()getgetDrawingCacheBackgroundColor()方法,但它们都返回了与包含片段的布局相对应的颜色值。

以下是活动代码部分:

private SeekBar seekBar;
private View fragmentOne;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    fragmentOne = findViewById(R.id.fragment1);
    seekBar = (SeekBar) findViewById(R.id.seekBar1);
    fragmentOne.getDrawingCacheBackgroundColor()

片段的xml文件,

<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@color/colorAccent"
android:padding="5dp"/>

包含上述的activity_main xml文件,以及其他4个片段和一个搜索栏:

    <?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/black">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">



        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="2"
            android:orientation="vertical"
            android:padding="5dp"
            android:paddingBottom="@dimen/activity_vertical_margin"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingRight="@dimen/activity_horizontal_margin"
            android:paddingTop="@dimen/activity_vertical_margin"
            android:layout_marginBottom="20dp"
            android:layout_marginTop="20dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            tools:context="com.maryland.modernartui_nikos.MainActivity">





            <fragment
                android:id="@+id/fragment1"
                android:name="com.maryland.modernartui_nikos.FragmentOne"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="2"
                tools:layout="@layout/fragment_fragment_one" />

            <fragment

                android:id="@+id/fragment2"
                android:name="com.maryland.modernartui_nikos.FragmentTwo"
                android:layout_width="match_parent"
                android:layout_height="117dp"
                tools:layout="@layout/fragment_fragment_two" />


        </LinearLayout>


        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="2"
            android:orientation="vertical"
            android:padding="2dp"
            android:paddingBottom="@dimen/activity_vertical_margin"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingRight="@dimen/activity_horizontal_margin"
            android:paddingTop="@dimen/activity_vertical_margin"
            android:showDividers="beginning|middle|end"
            android:layout_marginBottom="20dp"
            android:layout_marginTop="20dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            tools:context="com.maryland.modernartui_nikos.MainActivity">


            <fragment
                android:id="@+id/fragment3"
                android:name="com.maryland.modernartui_nikos.FragmentThree"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="2"
                tools:layout="@layout/fragment_fragment_three" />

            <fragment

                android:id="@+id/fragment4"
                     android:name="com.maryland.modernartui_nikos.FragmentFour"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="4"
                tools:layout="@layout/fragment_fragment_four" />


            <fragment

                android:id="@+id/fragment5"
                android:name="com.maryland.modernartui_nikos.FragmentFive"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="4"
                tools:layout="@layout/fragment_fragment_five" />


        </LinearLayout>



    </LinearLayout>

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />

该方法返回RelativeLayout的{​​{1}}而不是activity_main.xml的值。为什么?

2 个答案:

答案 0 :(得分:2)

找到解决此问题的方法:

        ColorDrawable colorDrawableOne = (ColorDrawable) fragmentOne.getBackground();
    ColorDrawable colorDrawableTwo = (ColorDrawable) fragmentTwo.getBackground();
    ColorDrawable colorDrawableFour = (ColorDrawable) fragmentFour.getBackground();
    ColorDrawable colorDrawableFive = (ColorDrawable) fragmentFive.getBackground();

    final int colorOne = colorDrawableOne.getColor();
    final int colorTwo = colorDrawableTwo.getColor();
    final int colorFour = colorDrawableFour.getColor();
    final int colorFive=   colorDrawableFive.getColor();

必须调用片段的getBackground()方法并将其存储到类型为casting的ColorDrawable变量中。 然后你可以调用这个对象的getColor()方法来获得所需的颜色。

答案 1 :(得分:1)

将id放在 relative_layout 上,使用 findViewById()获取 relative_layout ,您可以在其中使用view.getBaackground()。