应用主题不会动态更改

Question

当用户从AlertDialog中选择一个选项时，我正在尝试更改应用的主题或颜色。我做了相同的技术来改变字体的大小，它的工作正常。我不知道我为改变颜色所犯的错误。

的strings.xml：

    <resources>

<string-array name="font_sizes">
        <item>14</item>
        <item>16</item>
        <item>18</item>
        <item>20</item>
        <item>22</item>
    </string-array>

            <string-array name="app_colors">
                <item>0</item>
                <item>1</item>
                <item>2</item>
                <item>3</item>
                <item>4</item>
            </string-array>

        </resources>

styles.xml：

<resources xmlns:tools="http://schemas.android.com/tools">

        <!-- Base application theme. -->
        <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
            <!-- Customize your theme here. -->
            <item name="colorPrimary">@color/colorPrimary</item>
            <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
            <item name="colorAccent">@color/colorAccent</item>
            <item name="android:navigationBarColor" tools:targetApi="lollipop">@color/colorPrimaryDark</item>
        </style>

        <style name="AppTheme.NoActionBar">
            <item name="windowActionBar">false</item>
            <item name="windowNoTitle">true</item>
        </style>

        <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

        <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

        <style name="BlackTheme">
            <item name="colorPrimary">#FF000000</item>
            <item name="colorPrimaryDark">#FF000000</item>
            <item name="colorAccent">#FF000000</item>
            <item name="android:navigationBarColor" tools:targetApi="lollipop">#FF000000</item>
        </style>

        <style name="BlueTheme">
            <item name="colorPrimary">#FF0000FF</item>
            <item name="colorPrimaryDark">#FF0000FF</item>
            <item name="colorAccent">#FF0000FF</item>
            <item name="android:navigationBarColor" tools:targetApi="lollipop">#FF0000FF</item>
        </style>

        <style name="GreenTheme">
            <item name="colorPrimary">#008000</item>
            <item name="colorPrimaryDark">#008000</item>
            <item name="colorAccent">#008000</item>
            <item name="android:navigationBarColor" tools:targetApi="lollipop">#008000</item>
        </style>

        <style name="MagentaTheme">
            <item name="colorPrimary">#D500F9</item>
            <item name="colorPrimaryDark">#D500F9</item>
            <item name="colorAccent">#D500F9</item>
            <item name="android:navigationBarColor" tools:targetApi="lollipop">#D500F9</item>
        </style>

    </resources>

PreferencesActivity.java：

package sa.edu.qu.coc.cocapps.prefs;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.LinearLayout;
import sa.edu.qu.coc.cocapps.R;

public class PreferencesActivity extends AppCompatActivity implements View.OnClickListener {

    private Toolbar toolbar = null;
    public static final String PREFS_KEY = "preferences";
    private static int item = 0, color = 0;
    private LinearLayout fontSize;
    private LinearLayout appColor;
    private SharedPreferences prefs;
    private SharedPreferences.Editor editor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_preferences);

        prefs = getSharedPreferences(PREFS_KEY, Context.MODE_PRIVATE);

        initViews();

        setSupportActionBar(toolbar);

        fontSize.setOnClickListener(this);
        appColor.setOnClickListener(this);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    private void initViews() {
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        fontSize = (LinearLayout) findViewById(R.id.fontSize);
        appColor = (LinearLayout) findViewById(R.id.appColor);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.fontSize:
                AlertDialog.Builder changeFontSizeDialog = new AlertDialog.Builder(this)
                        .setTitle("Select Size")
                        .setIcon(android.R.drawable.sym_action_chat)
                        .setSingleChoiceItems(R.array.font_sizes, item, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                editor = prefs.edit();
                                editor.putInt("fontSize", i);
                                editor.commit();

                                item = i;
                            }
                        })
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                // DO not do anything.
                            }
                        });
                changeFontSizeDialog.show();
                break;

            case R.id.appColor:
                AlertDialog.Builder changeAppColorDialog = new AlertDialog.Builder(this)
                        .setTitle("Select color")
                        .setIcon(android.R.drawable.sym_action_chat)
                        .setSingleChoiceItems(R.array.app_colors, color, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                editor = prefs.edit();
                                editor.putInt("appColor", which);
                                editor.commit();

                                color = which;
                            }
                        })
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                // DO not do anything.
                            }
                        });
                changeAppColorDialog.show();
                break;
        }
    }

    @Override
    protected void onStart() {
        super.onStart();

        switch(prefs.getInt("appColor", 0))
        {
            case 0:
                this.setTheme(R.style.AppTheme);
                return;

            case 1:
                this.setTheme(R.style.BlackTheme);
                return;

            case 2:
                this.setTheme(R.style.BlueTheme);
                return;

            case 3:
                this.setTheme(R.style.GreenTheme);
                return;

            case 4:
                this.setTheme(R.style.MagentaTheme);
                return;
        }
    }

    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return true;
    }
}

Answer 1

因为主题不会像那样改变。在膨胀视图之前必须设置主题。之后，视图将不会刷新为新主题。但是，如果您要创建一个新视图，它将选择新主题。

Answer 2

为您的应用创建基本活动并覆盖onCreate以设置主题。从此基础活动中获取所有其他活动。

您还可以查看此特定教程（如果您正在执行活动主题）：

http://mrbool.com/how-to-change-the-layout-theme-of-an-android-application/25837

Answer 3

我解决了。以下代码是整个解决方案。

<强>的strings.xml：

<resources>
    <string-array name="font_sizes">
        <item>14</item>
        <item>16</item>
        <item>18</item>
        <item>20</item>
        <item>22</item>
    </string-array>

    <string-array name="app_colors">
        <item>1</item>
        <item>2</item>
        <item>3</item>
        <item>4</item>
        <item>5</item>
    </string-array>

</resources>

styles.xml :(另外，不要忘记将相同的自定义样式添加到styles.xml（v21））：

<resources xmlns:tools="http://schemas.android.com/tools">

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:navigationBarColor" tools:targetApi="lollipop">@color/colorPrimaryDark</item>
    </style>

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

    <style name="BlackTheme">
        <item name="colorPrimary">#FF000000</item>
        <item name="colorPrimaryDark">#FF000000</item>
        <item name="colorAccent">#FF000000</item>
        <item name="android:navigationBarColor" tools:targetApi="lollipop">#FF000000</item>
    </style>

    <style name="BlueTheme">
        <item name="colorPrimary">#FF0000FF</item>
        <item name="colorPrimaryDark">#FF0000FF</item>
        <item name="colorAccent">#FF0000FF</item>
        <item name="android:navigationBarColor" tools:targetApi="lollipop">#FF0000FF</item>
    </style>

    <style name="GreenTheme">
        <item name="colorPrimary">#008000</item>
        <item name="colorPrimaryDark">#008000</item>
        <item name="colorAccent">#008000</item>
        <item name="android:navigationBarColor" tools:targetApi="lollipop">#008000</item>
    </style>

    <style name="MagentaTheme">
        <item name="colorPrimary">#D500F9</item>
        <item name="colorPrimaryDark">#D500F9</item>
        <item name="colorAccent">#D500F9</item>
        <item name="android:navigationBarColor" tools:targetApi="lollipop">#D500F9</item>
    </style>

</resources>

<强> PreferencesActivity.java：

package sa.edu.qu.coc.cocapps.prefs;

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.LinearLayout;
import sa.edu.qu.coc.cocapps.R;

public class PreferencesActivity extends AppCompatActivity implements View.OnClickListener {

    private Toolbar toolbar = null;
    private LinearLayout fontSize, appColor;
    public static final String PREFS_KEY = "preferences";
    private static int item = 0, color = 0;
    private SharedPreferences prefs;
    private SharedPreferences.Editor editor;
    private Activity activity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        activity = this;
        prefs = getSharedPreferences(PREFS_KEY, Context.MODE_PRIVATE);
        switch(prefs.getInt("appColor", 0)) {
            case 0:
                activity.setTheme(R.style.AppTheme);
                break;

            case 1:
                activity.setTheme(R.style.BlackTheme);
                break;

            case 2:
                activity.setTheme(R.style.BlueTheme);
                break;

            case 3:
                activity.setTheme(R.style.GreenTheme);
                break;

            case 4:
                activity.setTheme(R.style.MagentaTheme);
                break;
        }
        setContentView(R.layout.activity_preferences);

        initViews();

        setSupportActionBar(toolbar);

        fontSize.setOnClickListener(this);
        appColor.setOnClickListener(this);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    private void initViews() {
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        fontSize = (LinearLayout) findViewById(R.id.fontSize);
        appColor = (LinearLayout) findViewById(R.id.appColor);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.fontSize:
                AlertDialog.Builder changeFontSizeDialog = new AlertDialog.Builder(this)
                        .setTitle("Select Size")
                        .setIcon(android.R.drawable.sym_action_chat)
                        .setSingleChoiceItems(R.array.font_sizes, item, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                editor = prefs.edit();
                                editor.putInt("fontSize", i);
                                editor.commit();

                                item = i;
                            }
                        })
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                // DO not do anything.
                            }
                        });
                changeFontSizeDialog.show();
                break;

            case R.id.appColor:
                AlertDialog.Builder changeAppColorDialog = new AlertDialog.Builder(this)
                        .setTitle("Select Color")
                        .setIcon(android.R.drawable.sym_action_chat)
                        .setSingleChoiceItems(R.array.app_colors, color, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                editor = prefs.edit();
                                editor.putInt("appColor", i);
                                editor.commit();

                                color = i;

                                activity.finish();
                                activity.startActivity(new Intent(activity, activity.getClass()));
                            }
                        })
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                // DO not do anything.
                            }
                        });
                changeAppColorDialog.show();
                break;
        }
    }

    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return true;
    }
}