如何通过 onBackPressed() 回到之前的 activity 并使用新主题？
How get back to previous activity by onBackPressed() and use new theme?
我有一个应用程序有 3 个 activities:main，第二个，首选项。
我可以从主要和第二个 one.for 偏好中调用偏好，我使用了 PreferenceActivity。
我的喜好我想改变主题。但问题是主题仅在 activity onCreate..
在更改首选项后我按 BackBTN，它会调用 onResume 方法但不会调用 onCreate。
在这种情况下，我打算在 onBackPressed 时主 activity，但它与我想要的不一样......
当我打算从 breferences 到 mainActivity 时，我也遇到了一个问题：之后我单击 onBackBTN，它让我转到 Preferences！是一个圆...
我在 Manifest whrite android:noHistory="true" 中尝试过，但它不起作用
这是我的代码 首选项
public class Preferences extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
@Override
public void onResume(){
super.onResume();
getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause(){
super.onPause();
getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
ListPreference listPref = (ListPreference)findPreference(getString(R.string.ListPref_key_1));
CharSequence currText = listPref.getEntry();
if (currText.toString().contains(getString(R.string.chooseThemeDayText))){
Utils.changeToTheme(this,Utils.THEME_DAY);
} else if (currText.toString().contains(getString(R.string.chooseThemeNightText))){
Utils.changeToTheme(this,Utils.THEME_NIGHT);
}
}
@Override
public void onBackPressed(){
Intent intent = new Intent(this,MainActivity.class);
startActivity(intent);
}
这是我的代码 Utils
public class Utils {
private static int sTheme;
public final static int THEME_DAY = 0;
public final static int THEME_NIGHT = 1;
//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){
switch (sTheme){
default:
case THEME_DAY:
activity.setTheme(R.style.ThemeDay);
break;
case THEME_NIGHT:
activity.setTheme(R.style.ThemeNight);
break;
}
}
这是我的代码 mainActivity
public class MainActivity extends Activity {
public PowerManager.WakeLock myWakeLock;
InputStream is;
AssetManager am;
Intent intent ;
public String taleName_str1,taleName_str2;
Button btn_tale1,btn_tale2;
int size;
byte[] buffer;
public static String TAG = "myLogs";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Utils.onActivityCreateSetTheme(this);
setContentView(R.layout.activity_main);
onWakeLock();
btn_tale1 = (Button) findViewById(R.id.btn_tale1);
btn_tale2 = (Button) findViewById(R.id.btn_tale2);
}
public void onClickRead(View view) {
switch (view.getId()){
case R.id.btn_tale1:
intent = new Intent("ua.andriyantonov.tales.tale1");
startActivity(intent);
break;
case R.id.btn_tale2:
intent = new Intent("ua.andriyantonov.tales.tale2");
startActivity(intent);
break;
}
}private void getTaleNames() {
am = getAssets();
try {
//taleName1
is = am.open("tale1_name.txt");
size = is.available();
buffer = new byte[size];
is.read(buffer);
is.close();
taleName_str1 = new String(buffer);
btn_tale1.setText(taleName_str1);
//taleName2
is=am.open("tale2_name.txt");
size=is.available();
buffer = new byte[size];
is.read(buffer);
is.close();
taleName_str2=new String(buffer);
btn_tale2.setText(taleName_str2);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.mainSettings:
intent = new Intent(this, Preferences.class);
startActivity(intent);
break;
}
return super.onOptionsItemSelected(item);
}
private void onWakeLock(){
final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
this.myWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My tag");
this.myWakeLock.acquire();
}
所以，
1.how 我可以通过 onBackPressed 从我的偏好设置返回到之前的 activity 并使用新主题吗？
2.How 在主 Activity?
上通过 onBackPressed 完成应用程序
02-05 14:48:54.845 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libEGL_mali.so
02-05 14:48:54.855 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_mali.so
02-05 14:48:54.865 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libGLESv2_mali.so
02-05 14:48:54.875 19539-19539/ua.andriyantonov.tales D/OpenGLRenderer﹕ Enabling debug mode 0
02-05 14:48:56.146 19539-19539/ua.andriyantonov.tales D/myLogs﹕ start
02-05 14:48:56.206 19539-19539/ua.andriyantonov.tales W/MediaPlayer﹕ mediaplayer went away with unhandled events
02-05 14:48:56.206 19539-19539/ua.andriyantonov.tales W/MediaPlayer﹕ mediaplayer went away with unhandled events
02-05 14:48:57.507 19539-19539/ua.andriyantonov.tales D/AndroidRuntime﹕ Shutting down VM
02-05 14:48:57.507 19539-19539/ua.andriyantonov.tales W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40dd1318)
02-05 14:48:57.517 19539-19539/ua.andriyantonov.tales E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method onClickRead(View) in the activity class ua.andriyantonov.tales.TaleActivity for onClick handler on view class android.widget.Button with id 'btn_tale2'
at android.view.View.onClick(View.java:3590)
at android.view.View.performClick(View.java:4103)
at android.view.View$PerformClick.run(View.java:17117)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4744)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: onClickRead [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at android.view.View.onClick(View.java:3583)
at android.view.View.performClick(View.java:4103)
at android.view.View$PerformClick.run(View.java:17117)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4744)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
02-05 14:48:59.920 19539-19539/ua.andriyantonov.tales I/Process﹕ Sending signal. PID: 19539 SIG: 9
Utils.onActivityCreateSetTheme(this);
setContentView(R.layout.activity_main);
onWakeLock();
btn_tale1 = (Button) findViewById(R.id.btn_tale1);
btn_tale2 = (Button) findViewById(R.id.btn_tale2);
只需将这些行复制到您的 MainActivity 的 onResume() 函数中，然后从您的首选项中删除 onBackPressed() 函数 class。
添加行
super.onResume();
onResume() 函数 在您粘贴的行之前。
如果您想在 BackPress 上退出应用程序，那么在 onBackPress 使用
moveTaskToBack(true);
finish()
对于另一个问题，我可以说 putString 使用 intent 获取一些字符串
然后通过 If 语句在另一个 activity 中检查条件 .. 如果它是真的然后将主题 acc 更改为条件 .. 我认为它会工作
我有一个应用程序有 3 个 activities:main，第二个，首选项。 我可以从主要和第二个 one.for 偏好中调用偏好，我使用了 PreferenceActivity。 我的喜好我想改变主题。但问题是主题仅在 activity onCreate.. 在更改首选项后我按 BackBTN，它会调用 onResume 方法但不会调用 onCreate。
在这种情况下，我打算在 onBackPressed 时主 activity，但它与我想要的不一样......
当我打算从 breferences 到 mainActivity 时，我也遇到了一个问题：之后我单击 onBackBTN，它让我转到 Preferences！是一个圆...
我在 Manifest whrite android:noHistory="true" 中尝试过，但它不起作用
这是我的代码 首选项
public class Preferences extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
@Override
public void onResume(){
super.onResume();
getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause(){
super.onPause();
getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
ListPreference listPref = (ListPreference)findPreference(getString(R.string.ListPref_key_1));
CharSequence currText = listPref.getEntry();
if (currText.toString().contains(getString(R.string.chooseThemeDayText))){
Utils.changeToTheme(this,Utils.THEME_DAY);
} else if (currText.toString().contains(getString(R.string.chooseThemeNightText))){
Utils.changeToTheme(this,Utils.THEME_NIGHT);
}
}
@Override
public void onBackPressed(){
Intent intent = new Intent(this,MainActivity.class);
startActivity(intent);
}
这是我的代码 Utils
public class Utils {
private static int sTheme;
public final static int THEME_DAY = 0;
public final static int THEME_NIGHT = 1;
//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){
switch (sTheme){
default:
case THEME_DAY:
activity.setTheme(R.style.ThemeDay);
break;
case THEME_NIGHT:
activity.setTheme(R.style.ThemeNight);
break;
}
}
这是我的代码 mainActivity
public class MainActivity extends Activity {
public PowerManager.WakeLock myWakeLock;
InputStream is;
AssetManager am;
Intent intent ;
public String taleName_str1,taleName_str2;
Button btn_tale1,btn_tale2;
int size;
byte[] buffer;
public static String TAG = "myLogs";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Utils.onActivityCreateSetTheme(this);
setContentView(R.layout.activity_main);
onWakeLock();
btn_tale1 = (Button) findViewById(R.id.btn_tale1);
btn_tale2 = (Button) findViewById(R.id.btn_tale2);
}
public void onClickRead(View view) {
switch (view.getId()){
case R.id.btn_tale1:
intent = new Intent("ua.andriyantonov.tales.tale1");
startActivity(intent);
break;
case R.id.btn_tale2:
intent = new Intent("ua.andriyantonov.tales.tale2");
startActivity(intent);
break;
}
}private void getTaleNames() {
am = getAssets();
try {
//taleName1
is = am.open("tale1_name.txt");
size = is.available();
buffer = new byte[size];
is.read(buffer);
is.close();
taleName_str1 = new String(buffer);
btn_tale1.setText(taleName_str1);
//taleName2
is=am.open("tale2_name.txt");
size=is.available();
buffer = new byte[size];
is.read(buffer);
is.close();
taleName_str2=new String(buffer);
btn_tale2.setText(taleName_str2);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.mainSettings:
intent = new Intent(this, Preferences.class);
startActivity(intent);
break;
}
return super.onOptionsItemSelected(item);
}
private void onWakeLock(){
final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
this.myWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My tag");
this.myWakeLock.acquire();
}
所以， 1.how 我可以通过 onBackPressed 从我的偏好设置返回到之前的 activity 并使用新主题吗？ 2.How 在主 Activity?
上通过 onBackPressed 完成应用程序02-05 14:48:54.845 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libEGL_mali.so
02-05 14:48:54.855 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_mali.so
02-05 14:48:54.865 19539-19539/ua.andriyantonov.tales D/libEGL﹕ loaded /system/lib/egl/libGLESv2_mali.so
02-05 14:48:54.875 19539-19539/ua.andriyantonov.tales D/OpenGLRenderer﹕ Enabling debug mode 0
02-05 14:48:56.146 19539-19539/ua.andriyantonov.tales D/myLogs﹕ start
02-05 14:48:56.206 19539-19539/ua.andriyantonov.tales W/MediaPlayer﹕ mediaplayer went away with unhandled events
02-05 14:48:56.206 19539-19539/ua.andriyantonov.tales W/MediaPlayer﹕ mediaplayer went away with unhandled events
02-05 14:48:57.507 19539-19539/ua.andriyantonov.tales D/AndroidRuntime﹕ Shutting down VM
02-05 14:48:57.507 19539-19539/ua.andriyantonov.tales W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40dd1318)
02-05 14:48:57.517 19539-19539/ua.andriyantonov.tales E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method onClickRead(View) in the activity class ua.andriyantonov.tales.TaleActivity for onClick handler on view class android.widget.Button with id 'btn_tale2'
at android.view.View.onClick(View.java:3590)
at android.view.View.performClick(View.java:4103)
at android.view.View$PerformClick.run(View.java:17117)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4744)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: onClickRead [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at android.view.View.onClick(View.java:3583)
at android.view.View.performClick(View.java:4103)
at android.view.View$PerformClick.run(View.java:17117)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4744)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
02-05 14:48:59.920 19539-19539/ua.andriyantonov.tales I/Process﹕ Sending signal. PID: 19539 SIG: 9
Utils.onActivityCreateSetTheme(this);
setContentView(R.layout.activity_main);
onWakeLock();
btn_tale1 = (Button) findViewById(R.id.btn_tale1);
btn_tale2 = (Button) findViewById(R.id.btn_tale2);
只需将这些行复制到您的 MainActivity 的 onResume() 函数中，然后从您的首选项中删除 onBackPressed() 函数 class。
添加行
super.onResume();
onResume() 函数 在您粘贴的行之前。
如果您想在 BackPress 上退出应用程序，那么在 onBackPress 使用
moveTaskToBack(true);
finish()
对于另一个问题，我可以说 putString 使用 intent 获取一些字符串
然后通过 If 语句在另一个 activity 中检查条件 .. 如果它是真的然后将主题 acc 更改为条件 .. 我认为它会工作