单击操作栏按钮时转到主屏幕

Question

我有一个图像按钮在我的应用程序中的每一个活动。当图像按钮被按下时，我需要转到主屏幕。我正在使用代码

btnLocation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               // Intent intent=new Intent(SpecificCategoryActivity.this,AreaSelectionActivity.class);

                //startActivity(intent);
                Intent homeIntent = new Intent(SpecificCategoryActivity.this, AreaSelectionActivity.class);
                homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(homeIntent);

            }
        });

但是，当我在单击图像按钮后从主屏幕导航时，它应该会从它调用的地方转到相同的页面。

例如，我有Activity1、Activity2、Activity3、Activity4等…Activity1是首页，我会选择国家，然后去Activity2，然后去Activity3，等等，但如果我从Activity4点击位置按钮，它应该去首页，在改变国家后，它必须回到Activity4。还有一件事是，如果国家已经被选中，应用程序将从Activity2启动。

我的Activity1代码是

btnStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            if(!autoComplete.getText().toString().isEmpty()) {

                if (isSelectedText) {


                    Intent intent = new Intent(CountrySelectionActivity.this, CategoryListActvity.class);
                     startActivity(intent);


                }
                else{
                    editor.clear();
                    editor.commit(); // commit changes
                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(CountrySelectionActivity.this);

                    alertDialogBuilder.setMessage("Please specify the correct country name");

                    AlertDialog alertDialog = alertDialogBuilder.create();
                    alertDialog.show();

                }
            }


        }
    });

请帮助解决这个问题。提前谢了。

Answer 1

I will give some pseudo code here
    In Activity4, locationbutton onclick listener will have the below code
    locationbutton .setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

       //save a variable to indicate that activity4 is reached
    savePreferences("**pagenavigated**", "4", context);  //need to write //savePreferences

     Intent intent = new Intent(activity4.this, homepage.class);
                         startActivity(intent);

        });
    //We can write this method commonly so all activity can access this
    public static void savePreferences(String key, String value, Context context) {

            SharedPreferences SharedPreferences = PreferenceManager
                    .getDefaultSharedPreferences(context);
            SharedPreferences.Editor editor = SharedPreferences.edit();
            editor.putString(key, value);
            editor.commit();
        }
    public static String loadPreferences(Context context, String key) {
            SharedPreferences SharedPreferences = PreferenceManager
                    .getDefaultSharedPreferences(context);
            String userDetails = SharedPreferences.getString(key, "");
            return userDetails;

        }
public static void removePreference(String key, Context context) {

        SharedPreferences SharedPreferences = PreferenceManager
                .getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = SharedPreferences.edit();
        editor.remove(key);
        editor.commit();

    }

    public static void removeAllPreferences(Context context) {

        SharedPreferences SharedPreferences = PreferenceManager
                .getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = SharedPreferences.edit();
        editor.clear();
        editor.commit();

    }
//In Activity 1, check for sharedpreference variable value and if it is 4, it //should get navigate to 4th screen . To make this happen , after checking //the value, we need to remove the shared value as well
//Activity 1
//In **country dropdown change listener**, check for the value of //**pagenavigated** and if it is 4, start the activity to go for activity 4. //Before that remove the value by using removeAllPreferences method
//So changes will be in onItemSelected
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String navigatedPage = loadPreferences(context,"pagenavigated");
if (navigatedPage.equalsIgnoreCase("4") {
removeAllPreferences(this);  //Remove the preference and go to activity 4)
Intent intent = new Intent(homepage.this, activity4.class);
                         startActivity(intent);
}



Hope that helps!!!