设置活动如何使用顶部的箭头导航回来

Question

Hi I've created a settings Activity and when I am in the settings menu and press the back button of the phone i get directed to the "home screen" which is correct but when I am pressing the top arrow of the settings menu nothings happends, it seems to be just a button. Please see imgur to see which arrow i mean. Back arrow in the settings activity, press here. I've looked around in the java code and seems to have found the button? All help is app reciated!!

Here is the whole java file of the settings menu.

 public class SettingsActivity extends AppCompatPreferenceActivity { /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object value) { String stringValue = value.toString(); if (preference instanceof RingtonePreference) { // For ringtone preferences, look up the correct display value // using RingtoneManager. if (TextUtils.isEmpty(stringValue)) { // Empty values correspond to 'silent' (no ringtone). preference.setSummary(R.string.pref_ringtone_silent); } else { Ringtone ringtone = RingtoneManager.getRingtone( preference.getContext(), Uri.parse(stringValue)); if (ringtone == null) { // Clear the summary if there was a lookup error. preference.setSummary(null); } else { // Set the summary to reflect the new ringtone display // name. String name = ringtone.getTitle(preference.getContext()); preference.setSummary(name); } } } else { // For all other preferences, set the summary to the value's // simple string representation. preference.setSummary(stringValue); } return true; } }; /** * Helper method to determine if the device has an extra-large screen. For * example, 10" tablets are extra-large. */ private static boolean isXLargeTablet(Context context) { return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE; } /** * Binds a preference's summary to its value. More specifically, when the * preference's value is changed, its summary (line of text below the * preference title) is updated to reflect the value. The summary is also * immediately updated upon calling this method. The exact display format is * dependent on the type of preference. * * @see #sBindPreferenceSummaryToValueListener */ private static void bindPreferenceSummaryToValue(Preference preference) { // Set the listener to watch for value changes. preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener); // Trigger the listener immediately with the preference's // current value. sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, PreferenceManager .getDefaultSharedPreferences(preference.getContext()) .getString(preference.getKey(), "")); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setupActionBar(); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ private void setupActionBar() { ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { // Show the Up button in the action bar. actionBar.setDisplayHomeAsUpEnabled(true); } } /** * {@inheritDoc} */ @Override public boolean onIsMultiPane() { return isXLargeTablet(this); } /** * {@inheritDoc} */ @Override @TargetApi(Build.VERSION_CODES.HONEYCOMB) public void onBuildHeaders(List<Header> target) { loadHeadersFromResource(R.xml.pref_headers, target); } /** * This method stops fragment injection in malicious applications. * Make sure to deny any unknown fragments here. */ protected boolean isValidFragment(String fragmentName) { return PreferenceFragment.class.getName().equals(fragmentName) || GeneralPreferenceFragment.class.getName().equals(fragmentName); } /** * This fragment shows general preferences only. It is used when the * activity is showing a two-pane settings UI. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) public static class GeneralPreferenceFragment extends PreferenceFragment { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref_general); setHasOptionsMenu(true); // Bind the summaries of EditText/List/Dialog/Ringtone preferences // to their values. When their values change, their summaries are // updated to reflect the new value, per the Android Design // guidelines. bindPreferenceSummaryToValue(findPreference("example_text")); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == android.R.id.home) { startActivity(new Intent(getActivity(), SettingsActivity.class)); return true; } return super.onOptionsItemSelected(item); } } } 

I think this is the button?

  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setupActionBar(); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ private void setupActionBar() { ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { // Show the Up button in the action bar. actionBar.setDisplayHomeAsUpEnabled(true); } } 

Answer 1

Open AndroidManifest.xml file. You need to define parent Activity for your SettingsActivity using:

<meta-data android:name="android.support.PARENT_ACTIVITY"
  android:value=".MainActivity"/>

then in your class:

 /**
     * Set up the {@link android.app.ActionBar}, if the API is available.
     */
    private void setupActionBar() {
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            // Show the Up button in the action bar.
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setDisplayShowHomeEnabled(true);
        }
    }

if you're using already AppCompatActivity with Toolbar , check this solution:

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

// add back arrow to toolbar
if (getSupportActionBar() != null){
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
}

If you're also want to handle this event or change the backButton icon, go to: Display Back Arrow on Toolbar Android

Edit: add to your activity class this code:

@Override
public boolean onOptionsItemSelected(MenuItem item) { 
        switch (item.getItemId()) {
        case android.R.id.home: 
            onBackPressed();
            return true;
        }

    return super.onOptionsItemSelected(item);
}

Hope it will help

Answer 2

在AndroidManifest.xml中，将其添加到Activity标记中

<meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".HomeScreenActivity"/>

Answer 3

Combining the answers above

SettingsActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getFragmentManager().beginTransaction().replace(android.R.id.content, new MainSettingsFragment()).commit();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {
        onBackPressed();
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    this.finish();
    Intent intent = new Intent(this, MainActivity.class);
    startActivity(intent);
}

AndroidManifest.xml

<activity android:name=".SettingsActivity"
    android:label="@string/title_settings">
    <meta-data android:name="android.support.PARENT_ACTIVITY"
    android:value=".MainActivity"/>
</activity>

Answer 4

You Should try it.

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // handle arrow click here
        if (item.getItemId() == android.R.id.home) {
            finish(); // close this activity and return to preview activity (if there is any)`enter code here`
        }

        return super.onOptionsItemSelected(item);
    }