如何使用共享首選項保存和加載主題？
[英]how do i save and load theme using shared preferences?
問題描述
請幫幫我，已經 3 天了，我仍然不明白為什么我的共享偏好沒有保存或加載我的主題
這是我的主要活動
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String SHARED_PREF = "sharedPrefs";
public Button button11, button22, button33;
@Override
protected void onCreate(Bundle savedInstanceState) {
int LT = loadTheme(0);
int ST = saveTheme(0);
Utils.onActivityCreateSetTheme(this, LT,ST);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(this);
findViewById(R.id.button2).setOnClickListener(this);
findViewById(R.id.button3).setOnClickListener(this);
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.button1:
Utils.changeToTheme(this, Utils.THEME_DEFAULT);
loadTheme(0);
saveTheme(0);
break;
case R.id.button2:
Utils.changeToTheme(this, Utils.THEME_WHITE);
loadTheme(1);
saveTheme(1);
break;
case R.id.button3:
Utils.changeToTheme(this, Utils.THEME_BLUE);
loadTheme(2);
saveTheme(2);
break;
}
}
public void restartApp() {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
finish();
}
public int loadTheme(int defval) {
if (defval == 1) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
sharedPreferences.getInt("Theme", 1);
Toast.makeText(this, "LOADTHEMEVAL= 1", Toast.LENGTH_SHORT).show();
} else if (defval == 2) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
sharedPreferences.getInt("Theme", 2);
Toast.makeText(this, "LOADTHEMEVAL= 2", Toast.LENGTH_SHORT).show();
} else if(defval == 0) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
sharedPreferences.getInt("Theme", 0);
Toast.makeText(this, "LOADTHEMEVAL= 0", Toast.LENGTH_SHORT).show();
}
return defval;
}
public int saveTheme(int defval) {
if (defval == 2) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.clear();
prefEditor.putInt("Theme", 2);
prefEditor.apply();
Toast.makeText(this, "SAVETHEMEVAL= 2", Toast.LENGTH_SHORT).show();
} else if (defval == 1) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.clear();
prefEditor.putInt("Theme", 1);
prefEditor.apply();
Toast.makeText(this, "SAVETHEMEVAL= 1", Toast.LENGTH_SHORT).show();
} else if (defval == 0) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.clear();
prefEditor.putInt("Theme", 0);
prefEditor.apply();
Toast.makeText(this, "SAVETHEMEVAL= 0", Toast.LENGTH_SHORT).show();
}
return defval;
}
}
這是我的實用程序
package com.perz.themeactivity;
import android.app.Activity;
import android.content.Intent;
public class Utils
{
private static int sTheme;
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
/**
* Set the theme of the Activity, and restart it by creating a new Activity of the same type.
*/
public static void changeToTheme(Activity activity, int theme)
{
sTheme = theme;
activity.finish();
activity.startActivity(new Intent(activity, activity.getClass()));
}
/** Set the theme of the activity, according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity, int theme, int them)
{
switch (sTheme)
{
default:
case THEME_DEFAULT:
activity.setTheme(R.style.AppTheme);
break;
case THEME_WHITE:
activity.setTheme(R.style.Cerv_Theme);
break;
case THEME_BLUE:
activity.setTheme(R.style.Giant_Theme);
break;
}
}
}
這是我的activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Theme default"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.101"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.25"
tools:ignore="MissingConstraints" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cerv_Theme"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.878"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.25"
tools:ignore="MissingConstraints" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Giant Theme"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.486"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.366"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?attr/textcolor"
android:text="PRIMARYLETTER"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.112"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?attr/gaugebackcolor"
android:text="COLOR SECONDARY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.553"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?attr/gaugebackcolor"
android:text="COLOR TERTIARY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.899"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>
和我的顏色。xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#E80A0A </color>
<color name="colorPrimaryDark">#E80A0A </color>
<color name="colorPrimaryletter">#E80A0A</color>
<color name="colorSecondary">#000000</color>
<color name="colorTertiary">#E80A0A</color>
<color name="colorAccent">#000000</color>
<color name="pure_black">#000000</color>
</resources>
最后是我的風格。xml
<resources>
<!-- 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="backgroundColor">@color/pure_black</item>
<item name="textcolor">@color/colorPrimaryletter</item>
<item name="gaugebackcolor">@color/colorSecondary</item>
<item name="scalecolor">@color/colorTertiary</item>
<item name="colorback">@color/colorAccent</item>
</style>
<style name="Cerv_Theme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#000000</item>
<item name="colorPrimaryDark">#EFECEC</item>
<item name="colorAccent">#000000</item>
<item name="backgroundColor">#000000</item>
<item name="textcolor">#EFECEC</item>
<item name="gaugebackcolor">#FFFFFF</item>
<item name="scalecolor">#000000</item>
<item name="colorback">#000000</item>
</style>
<style name="Giant_Theme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#0143C6</item>
<item name="colorPrimaryDark">#FFFFFF</item>
<item name="colorAccent">#0439A3</item>
<item name="backgroundColor">#000000</item>
<item name="textcolor">#EFECEC</item>
<item name="gaugebackcolor">#0143C6</item>
<item name="scalecolor">#000000</item>
<item name="colorback">#0439A3</item>
</style>
</resources>
請幫幫我，我真的很想完成這項工作，我嘗試了幾個與我的問題相關的答案，例如： 在 Android (Android Studio) 中更改主題， 使用共享首選項保存 android 主題，使用共享首選項存儲 int 值， 如何將主題存儲在 Android 中的 SharedPreference 上， 如何更改 int 值 onclick 並將其傳遞給另一個活動？ 在 android 上？ 最后共享偏好不是持久的，但它們並沒有解決我的問題:(
在此鏈接： 更改 Android 中的主題（Android Studio）
我試圖將答案應用於我的應用程序
現在 UTILS 看起來像這樣
package com.perz.themeactivity;
import android.app.Activity;
import android.content.Intent;
public class Utils
{
private static int sTheme;
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
/**
* Set the theme of the Activity, and restart it by creating a new Activity of the same type.
*/
public static void changeToTheme(Activity activity, int theme)
{
sTheme = theme;
activity.finish();
activity.startActivity(new Intent(activity, activity.getClass()));
}
/** Set the theme of the activity, according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity, int sTheme)
{
switch (sTheme)
{
default:
case THEME_DEFAULT:
int myTheme = R.style.AppTheme;
activity.setTheme(myTheme);
MainActivity obj0 = new MainActivity();
obj0.saveTheme(myTheme);
break;
case THEME_WHITE:
int myTheme1 = R.style.Cerv_Theme;
activity.setTheme(myTheme1);
MainActivity obj1 = new MainActivity();
obj1.saveTheme(myTheme1);
break;
case THEME_BLUE:
int myTheme2 = R.style.Giant_Theme;
activity.setTheme(myTheme2);
MainActivity obj2 = new MainActivity();
obj2.saveTheme(myTheme2);
break;
}
}
}
和主要活動
{
private static final String SHARED_PREF = "sharedPrefs";
private static final int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
public Button button11, button22, button33;
@Override
protected void onCreate(Bundle savedInstanceState) {
int theme = loadTheme();
Utils.onActivityCreateSetTheme(this,theme );
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(this);
findViewById(R.id.button2).setOnClickListener(this);
findViewById(R.id.button3).setOnClickListener(this);
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.button1:
Utils.changeToTheme(this, Utils.THEME_DEFAULT);
break;
case R.id.button2:
Utils.changeToTheme(this, Utils.THEME_WHITE);
break;
case R.id.button3:
Utils.changeToTheme(this, Utils.THEME_BLUE);
break;
}
}
public void restartApp() {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
finish();
}
public int loadTheme(){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
//Load theme color
int theme = sharedPreferences.getInt("Theme",THEME_DEFAULT); //RED is default color, when nothing is saved yet
return theme;
}
public void saveTheme(int theme)
{
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.putInt("Theme",theme);
}
}
現在調試器 output
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.perz.themeactivity, PID: 23544
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.perz.themeactivity/com.perz.themeactivity.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
at android.content.ContextWrapper.getPackageName(ContextWrapper.java:135)
at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:537)
at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:526)
at com.perz.themeactivity.MainActivity.saveTheme(MainActivity.java:66)
at com.perz.themeactivity.Utils.onActivityCreateSetTheme(Utils.java:30)
at com.perz.themeactivity.MainActivity.onCreate(MainActivity.java:23)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
很明顯，即使我稍微調整一下，它也不能正常工作，繼續前進。 接下來是： 使用共享首選項保存 android 主題
我用了最好的答案
現在的實用程序：
{
private static int sTheme;
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
/**
* Set the theme of the Activity, and restart it by creating a new Activity of the same type.
*/
public static void changeToTheme(Activity activity, int theme)
{
sTheme = theme;
activity.finish();
activity.startActivity(new Intent(activity, activity.getClass()));
}
/** Set the theme of the activity, according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity, int theme)
{
switch (sTheme)
{
default:
case THEME_DEFAULT:
activity.setTheme(R.style.AppTheme);
break;
case THEME_WHITE:
activity.setTheme(R.style.Cerv_Theme);
break;
case THEME_BLUE:
activity.setTheme(R.style.Giant_Theme);
break;
}
}
}
和主要活動：
{
private static final String SHARED_PREF = "sharedPrefs";
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
public Button button11, button22, button33;
@Override
protected void onCreate(Bundle savedInstanceState) {
Utils.onActivityCreateSetTheme(this, new SharedPreferencesManager(this).retrieveInt("theme", THEME_DEFAULT));
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(this);
findViewById(R.id.button2).setOnClickListener(this);
findViewById(R.id.button3).setOnClickListener(this);
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
Utils.changeToTheme(this, Utils.THEME_DEFAULT);
new SharedPreferencesManager(getApplicationContext()).storeInt("theme", THEME_DEFAULT);
break;
case R.id.button2:
Utils.changeToTheme(this, Utils.THEME_WHITE);
new SharedPreferencesManager(getApplicationContext()).storeInt("theme", THEME_WHITE);
break;
case R.id.button3:
Utils.changeToTheme(this, Utils.THEME_BLUE);
new SharedPreferencesManager(getApplicationContext()).storeInt("theme", THEME_BLUE);
break;
}
}
public void restartApp() {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
finish();
}
}
和我的 SHAREDPREFERENCEMANAGER
package com.perz.themeactivity;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
public class SharedPreferencesManager {
/**
* SharedPreferences to store the settings. This way, they'll be available next time the user starts the app
*/
private SharedPreferences sPreferences;
/**
* Editor to make changes on sharedPreferences
*/
private SharedPreferences.Editor sEditor;
/**
* The class itself
*/
private Context context;
public SharedPreferencesManager(Context context) {
this.context = context;
sPreferences = PreferenceManager.getDefaultSharedPreferences(context);
}
private SharedPreferences.Editor getEditor() {
return sPreferences.edit();
}
/**
* Store a boolean value in sharedPreferences
*
* @param tag identifies the value
* @param value the value itself
*/
public void storeBoolean(String tag, boolean value) {
sEditor = getEditor();
sEditor.putBoolean(tag, value);
sEditor.commit();
}
/**
* Store a string in sharedPreferences
*
* @param tag identifies the value
* @param str the string itself
*/
public void storeString(String tag, String str) {
sEditor = getEditor();
sEditor.putString(tag, str);
sEditor.commit();
}
/**
* @param tag identifies the value
* @param defValue default value
* @return the stored or default value
*/
public boolean retrieveBoolean(String tag, boolean defValue) {
return sPreferences.getBoolean(tag, defValue);
}
/**
* @param tag identifies the string
* @param defStr default string
* @return the stored or default string
*/
public String retrieveString(String tag, String defStr) {
return sPreferences.getString(tag, defStr);
}
/**
* @param tag identifies the value
* @param defValue default value
* @return the stored or default value
*/
public int retrieveInt(String tag, int defValue) {
return sPreferences.getInt(tag, defValue);
}
/**
* @param tag identifies the value
* @param defValue the value itself
*/
public void storeInt(String tag, int defValue) {
sEditor = getEditor();
sEditor.putInt(tag, defValue);
sEditor.commit();
}
//Incorrect Bracket Closing Removal
}
現在，當我退出應用程序時，它返回到默認主題並且它不存儲 int 我只想保留我選擇保留的主題，即使我退出應用程序並返回，如果這看起來有點復雜，我深表歉意
1 個解決方案
解決方案1
0 已采納 2020-07-12 23:52:00
找到答案了！！！ 首先，您需要確保在 UTILS
public static void onActivityCreateSetTheme(Activity activity, int theme)
{
switch (sTheme)
應該是這樣的
public static void onActivityCreateSetTheme(Activity activity, int sTheme)
{
switch (sTheme)
它應該始終匹配“開關”部分
關於您的活動/主要活動的第二件事
而不是使用“保存主題”，而是像這樣將您的主題直接保存在 onclicklistener 上
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.button1:
Utils.changeToTheme(this, Utils.THEME_DEFAULT);
defval = 0;
Reptheme += Utils.THEME_DEFAULT;
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.putInt("Theme", Utils.THEME_DEFAULT);
prefEditor.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 0", Toast.LENGTH_SHORT).show();
break;
case R.id.button2:
Utils.changeToTheme(this, Utils.THEME_WHITE);
defval = 1;
Reptheme += Utils.THEME_WHITE;
SharedPreferences sharedPreferences1 = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor1 = sharedPreferences1.edit();
prefEditor1.putInt("Theme", Utils.THEME_WHITE);
prefEditor1.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 1", Toast.LENGTH_SHORT).show();
break;
case R.id.button3:
Utils.changeToTheme(this, Utils.THEME_BLUE);
defval = 2;
Reptheme += Utils.THEME_BLUE;
SharedPreferences sharedPreferences2 = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor2 = sharedPreferences2.edit();
prefEditor2.putInt("Theme", Utils.THEME_BLUE);
prefEditor2.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 2", Toast.LENGTH_SHORT).show();
break;
}
}
最后像這樣使用“加載主題”
public int loadTheme(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
int theme = sharedPreferences.getInt("Theme",1);
return theme;
}
總而言之，這是我的主要活動
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String SHARED_PREF = "sharedPrefs";
int defval = 1;
int Reptheme ;
public Button button11, button22, button33;
TextView value;
@Override
protected void onCreate(Bundle savedInstanceState) {
Utils.onActivityCreateSetTheme(this, loadTheme());
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(this);
findViewById(R.id.button2).setOnClickListener(this);
findViewById(R.id.button3).setOnClickListener(this);
value = (TextView) findViewById(R.id.textView4);
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
defval = sharedPreferences.getInt("Theme", + defval);
value.setText("null" + defval);
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.button1:
Utils.changeToTheme(this, Utils.THEME_DEFAULT);
defval = 0;
Reptheme += Utils.THEME_DEFAULT;
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor = sharedPreferences.edit();
prefEditor.putInt("Theme", Utils.THEME_DEFAULT);
prefEditor.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 0", Toast.LENGTH_SHORT).show();
break;
case R.id.button2:
Utils.changeToTheme(this, Utils.THEME_WHITE);
defval = 1;
Reptheme += Utils.THEME_WHITE;
SharedPreferences sharedPreferences1 = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor1 = sharedPreferences1.edit();
prefEditor1.putInt("Theme", Utils.THEME_WHITE);
prefEditor1.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 1", Toast.LENGTH_SHORT).show();
break;
case R.id.button3:
Utils.changeToTheme(this, Utils.THEME_BLUE);
defval = 2;
Reptheme += Utils.THEME_BLUE;
SharedPreferences sharedPreferences2 = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
SharedPreferences.Editor prefEditor2 = sharedPreferences2.edit();
prefEditor2.putInt("Theme", Utils.THEME_BLUE);
prefEditor2.apply();
value.setText("null" +defval);
Toast.makeText(this, "SAVETHEMEVAL= 2", Toast.LENGTH_SHORT).show();
break;
}
}
public void restartApp() {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
finish();
}
public int loadTheme(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
//Load theme colorfdsfdssdfsdfsfsd
int theme = sharedPreferences.getInt("Theme",1); //RED is default color, when nothing is saved yet
return theme;
}
}
和我的 UTILS.java
import android.app.Activity;
import android.content.Intent;
public class Utils
{
private static int sTheme;
public final static int THEME_DEFAULT = 0;
public final static int THEME_WHITE = 1;
public final static int THEME_BLUE = 2;
/**
* Set the theme of the Activity, and restart it by creating a new Activity of the same type.
*/
public static void changeToTheme(Activity activity, int theme)
{
sTheme = theme;
activity.finish();
activity.startActivity(new Intent(activity, activity.getClass()));
}
/** Set the theme of the activity, according to the configuration. */
public static void onActivityCreateSetTheme(Activity activity, int sTheme)
{
switch (sTheme)
{
default:
case THEME_DEFAULT:
activity.setTheme(R.style.AppTheme);
break;
case THEME_WHITE:
activity.setTheme(R.style.Cerv_Theme);
break;
case THEME_BLUE:
activity.setTheme(R.style.Giant_Theme);
break;
}
}
}
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