安卓：从preferences选择主题颜色 [英] Android: Selecting theme color from preferences

问题描述

我要设置我的应用程序的抽屉式导航栏，通过preferences颜色pressed项目，但我似乎无法找到一个方法来做到这一点。我已经创造了我的preferences与十六进制颜色codeS作为值的列表，我不知道如何在我的Java类中使用的值。帮助！

I wish to set the color pressed item of navigation drawer of my app through preferences but I can't seem to find a way to do so. I have created a list in my preferences with hex color codes as values and I have no idea how to use the values in my java class. HELP!

推荐答案

试试这个方法：
首先定义新颜色colors.xml价值观是这样的：

Try this approach: First define your new colors in colors.xml in values like this:

<color name="my_blue">#4FC3F7</color>
<color name="my_yellow">#FDD835</color>

然后，像这样定义（my_theme.xml）一个新的主题：

Then, you define a new theme like this (my_theme.xml):

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

    <style name="MyRandomTheme" parent="Theme.AppCompat.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/my_blue</item>
        <item name="colorPrimaryDark">@color/my_blue</item>
        <item name="android:navigationBarColor">@color/my_blue</item>
    </style>

</resources>

然后，看看我是如何动态地改变颜色：

Then, look at how I change the color dynamically:

我的布局：

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Blue"
    android:id="@+id/btnBlue"
    android:layout_below="@+id/imageView"
    android:layout_alignLeft="@+id/imageView"
    android:layout_alignStart="@+id/imageView"
    android:background="#162c69" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Yellow"
    android:id="@+id/btnYellow"
    android:layout_below="@+id/imageView"
    android:layout_alignRight="@+id/imageView"
    android:layout_alignEnd="@+id/imageView"
    android:background="#9b8a09" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Mix"
    android:id="@+id/btnMix"
    android:layout_below="@+id/imageView"
    android:layout_centerHorizontal="true"
    android:background="#920f08" />

我的活动：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    this.setTheme(R.style.MyRandomTheme);


    setContentView(R.layout.activity_main);

    //Change theme to yellow
    Button yellowButton = (Button) findViewById(R.id.btnYellow);
    yellowButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (Build.VERSION.SDK_INT >= 21) {
                getWindow().setNavigationBarColor(getResources().getColor(R.color.my_yellow));
                getWindow().setStatusBarColor(getResources().getColor(R.color.my_yellow));
            }
        }
    });

    //Change theme to blue
    Button blueButton = (Button) findViewById(R.id.btnBlue);
    blueButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (Build.VERSION.SDK_INT >= 21) {
                getWindow().setNavigationBarColor(getResources().getColor(R.color.my_blue));
                getWindow().setStatusBarColor(getResources().getColor(R.color.my_blue));
            }
        }
    });

    //Change theme to mixture of blue and yellow
    Button mixButton = (Button) findViewById(R.id.btnMix);
    mixButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (Build.VERSION.SDK_INT >= 21) {
                getWindow().setNavigationBarColor(getResources().getColor(R.color.my_blue));
                getWindow().setStatusBarColor(getResources().getColor(R.color.my_yellow));
            }
        }
    });

}

结果：

也从preferences读取和写入preferences试试这个：

Also for reading from preferences and writing to preferences try this:

        //Write to preferences
        String s = "this is a test.";
        SharedPreferences prefs = this.getSharedPreferences("MyPrefs",this.MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString("A", s);
        editor.apply();
        //Fetch from preferences
        SharedPreferences prefs2 = this.getSharedPreferences("MyPrefs", this.MODE_PRIVATE);
        if(prefs2 != null) {
            String text2 = prefs.getString("A","");
            Log.d(LOG_TAG, "This is the string: "+text2);
        }

您可以通过您的参数，如R.color.my_yellow，并在你的preferences直到用户更改。我希望它能帮助。让我知道如果你有任何问题。

You can pass your parameters like "R.color.my_yellow" and have it in your preferences till your user change it. I hope it helps. Let me know if you have any question.

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