Java 在Android应用程序中更改运行时主题
我是android编程新手,我正在尝试在我的手电筒应用程序上应用一个主题。错误似乎是当我尝试应用两个主题之一时单击“确定”按钮 以下是我在SimpleNotificationAppActivity.java上的代码Java 在Android应用程序中更改运行时主题,java,android,android-layout,themes,Java,Android,Android Layout,Themes,我是android编程新手,我正在尝试在我的手电筒应用程序上应用一个主题。错误似乎是当我尝试应用两个主题之一时单击“确定”按钮 以下是我在SimpleNotificationAppActivity.java上的代码 public class SimpleNotificationAppActivity extends Activity implements android.content.DialogInterface.OnClickListener{ private boolean is
public class SimpleNotificationAppActivity extends Activity implements android.content.DialogInterface.OnClickListener{
private boolean isFlashOn = false;
private Camera camera;
//private ImageButton button;
private Button button;
private MediaPlayer button2;
////////////
public final static int CREATE_DIALOG = -1;
public final static int THEME_HOLO_LIGHT = 0;
public final static int THEME_HOLO = 1;
int position;
///////////////
@Override
protected void onStop() {
super.onStop();
if (camera != null) {
camera.release();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setTheme(android.R.style.Theme_Holo_Light);
setContentView(R.layout.main);
button = (Button) findViewById(R.id.buttonFlashlight);
button2 = MediaPlayer.create(SimpleNotificationAppActivity.this,R.raw.two_tone_nav); //SOM DO CLIQUE
//button = (ImageButton) findViewById(R.drawable.image_on);
//button.setBackgroundResource(R.drawable.switch_on);
Context context = this;
PackageManager pm = context.getPackageManager();
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Log.e("err", "Device has no camera.");
Toast.makeText(getApplicationContext(),
"Sorry, your device doesn't have camera :(",
Toast.LENGTH_SHORT).show();
return;
}
camera = Camera.open();
final Parameters p = camera.getParameters();
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if (isFlashOn) {
Log.i("info", "torch is turned off!");
button2.start();
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
isFlashOn = false;
//button.setText("Torch-ON");
button.setBackgroundResource(R.drawable.button_on);
} else {
Log.i("info", "torch is turned on!");
button2.start();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
isFlashOn = true;
//button.setText("Torch-OFF");
button.setBackgroundResource(R.drawable.button_off);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
super.onOptionsItemSelected(item);
switch(item.getItemId()){
case R.id.theme:
themeMenuItem();
break;
case R.id.about:
aboutMenuItem();
break;
}
return true;
}
private void aboutMenuItem(){
new AlertDialog.Builder(this)
.setTitle("About")
.setMessage("Flashlight app developed and designed by Rui Moreira.\n\nfacebook.com/RuiSousaMoreira")
.setNeutralButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.setIcon(R.drawable.app_icon_small)
.show();
}
private void themeMenuItem(){
//setTheme(android.R.style.Theme_Holo);
//setTheme(R.layout.main2);
////////////////////////////////////////////////////
position = getIntent().getIntExtra("position", -1);
switch(position)
{
case CREATE_DIALOG:
createDialog();
break;
case THEME_HOLO_LIGHT:
setTheme(android.R.style.Theme_Holo_Light);
break;
case THEME_HOLO:
setTheme(android.R.style.Theme_Holo_Light_DarkActionBar);
break;
default:
}
//super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
////////////////////////////////////////////////////
}
private void createDialog()
{
/** Options for user to select*/
String choose[] = {"Holo Light","Holo Dark"};
AlertDialog.Builder b = new AlertDialog.Builder(this);
/** Setting a title for the window */
b.setTitle("Choose your Application Theme");
/** Setting items to the alert dialog */
b.setSingleChoiceItems(choose, 0, null);
/** Setting a positive button and its listener */
b.setPositiveButton("OK", this);//
/*TRIED THIS TOO, BUT DOESNT SOLVES THE PROBLEM
*
* b.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
///TESTE
AlertDialog alert = (AlertDialog)dialog;
int position = alert.getListView().getCheckedItemPosition();
finish();
Intent intent = new Intent();
intent.putExtra("position", position);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
///TESTE
}
});*/
/** Setting a positive button and its listener */
b.setNegativeButton("Cancel", null);
/** Creating the alert dialog window using the builder class */
AlertDialog d = b.create();
/** show dialog*/
d.show();
}
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
AlertDialog alert = (AlertDialog)dialog;
int position = alert.getListView().getCheckedItemPosition();
finish();
Intent intent = new Intent(this, SimpleNotificationAppActivity.class);
intent.putExtra("position", position);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
基本上,当我点击这里的“主题”时:
此对话框将显示:
我选择主题,并想按ok更新应用程序的主题。
谁能帮我实现这个目标?我很欣赏你的建议:)正如你所尝试的,这是改变主题的方法。但是,
请注意,应在中实例化任何视图之前调用此函数
上下文(例如在调用setContentView(View)或
充气(内部,视图组))
因此,您必须重新启动应用程序。我的解决方案,可能是肮脏的,是杀死
活动
,调用应用程序的主要活动,并在意图
中提供一些关于必须应用什么主题的信息。就像小孩子说的那样,简单地使用setTheme()
是不起作用的。它应该在设置内容视图(视图)
之前使用。您需要做的是按一下“确定”按钮重新启动应用程序,然后在应用程序重新启动时,通过setTheme()设置新主题(在setContentView(视图)之前执行此操作)
要在一秒钟后重新启动应用程序,可以使用此选项(根据应用程序替换活动):
下面是我在评论中提到的示例代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences shared=getSharedPreferences("app_name", Activity.MODE_PRIVATE);
String theme=shared.getString("theme", null);
if(theme != null && theme.equals("LIGHT")){
setTheme(R.style.Theme_light);
}else{
setTheme(R.style.Theme_dark);
}
setContentView(R.layout.activity_main);
}
发布错误报告/logcat请重新启动应用程序,新主题才能生效,并在
super()之前应用新主题。onCreate()
Eclipse不会显示任何错误,因为我可以运行应用程序。当我运行它并按“OK”时,会发生这种情况[link()@ruimorera请使用imgur
上传imagesTry,谢谢你的建议。我有点理解这个想法,但我不知道如何在onCreate()中设置主题。public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setTheme(???);setContentView(R.layout.main);…..
我做不到setTheme(android.R.style.Theme\u Holo\u Light\u DarkActionBar)因为应用程序总是以暗主题启动,而不是在您的情况下选择的主题,您可以将主题保存在SharedReferences中,该主题由用户选择,并在“OK”按钮的onclick方法中使用该重新启动代码。然后在onCreate()中方法,从SharedReferences获取保存的主题,并将其设置为setTheme()。我将通过添加该部分来更新答案。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences shared=getSharedPreferences("app_name", Activity.MODE_PRIVATE);
String theme=shared.getString("theme", null);
if(theme != null && theme.equals("LIGHT")){
setTheme(R.style.Theme_light);
}else{
setTheme(R.style.Theme_dark);
}
setContentView(R.layout.activity_main);
}