问题：
如何使用共享首选项保存和加载主题？
凌展
以下是我的主要活动
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;
}
}
这是我的作品
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;
}
}
}
下面是我的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>
<?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>
<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>
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;
}
}
}
和主要活动
{
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);
}
}
现在调试器输出
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)
很明显，即使我稍微调整一下，它也不能正常工作。接下来是：使用共享首选项保存android主题
{
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;
}
}
}
{
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();
}
}
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
}
共有1个答案
温凯
找到答案了！！！首先，您需要确保在UTILS
public static void onActivityCreateSetTheme(Activity activity, int theme)
{
switch (sTheme)
应该是这样的
public static void onActivityCreateSetTheme(Activity activity, int sTheme)
{
switch (sTheme)
它应该总是与“开关”部分匹配
@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 int loadTheme(){
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREF, MODE_PRIVATE);
int theme = sharedPreferences.getInt("Theme",1);
return theme;
}
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;
}
}
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;
}
}
}
类似资料：
-
你好，我正在尝试保存一个共享首选项的主题。当用户点击某个主题的按钮时，我希望该主题被设置为默认并保存，所以当他们重新打开应用程序时，它仍然是那个新主题。
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我正在创建一个番茄工作计时器应用程序。它有2项活动： 主要活动是设置时间 我已经创建了一个对象，它保存了设置的时间，我希望这些时间显示在Recents活动中的按钮中。但是，似乎没有保存数据，而是显示了包名称。
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我正在尝试将Firebase DataSnapshot对象保存到SharedReferences。 请看这篇文章，我在其中设计了一种方法来实现这一点。 ... 到目前为止，我已经尝试了： > 使用Gson。Json方法。结果：似乎不起作用。。。我不认为DataSnapshot类是“POJO”类型的类。。。至少没有一个能与gson合作。 使用此方法： 私有静态字符串toString（可序列化o）引发
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我在共享首选项中保存列表并将其显示在列表视图中没有问题，但我的问题是当我重新启动应用程序并尝试将项目添加到列表视图时 旧的存储项目已删除.有我的代码： } public void getDates（）{
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问题内容： 如何确保UTF8用于共享首选项菜单？我有一个android偏好设置菜单，除其他外，该菜单允许用户设置其名称。 我需要知道如何将共享首选项中存储的数据转换为UTF8格式 在res / xml文件夹中一个名为settings的文件中，首选项菜单使用utf8编码以xml布局，如下所示： 处理这个的类是 我假设该设置 将确保文本将以UTF8格式编码，但这并非总是如此。我正在获得各种格式的价值。
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你好。我需要帮助。我想用SharedPreferences在Listview中保存动态添加的项目。我正在添加带有公共void favekle函数的listview项目。我正在向数组列表添加条目