Question

我在向我的应用添加设置页面时遇到问题。

我已经创建了一个SettingsActivity，SettingsFragment，一个actibity_settings.xml布局和一个preferences.xml文件。

我在activity_main视图中放置了一个按钮，并向MainActivity添加了一个intent来调用SettingsActivity。

然而，放置按钮似乎无能为力。

SettingsActivity

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {

    private SharedPreferences pref;

    public static void start(Context context) {
        Intent intent = new Intent(context, SettingsActivity.class);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        pref = PreferenceManager.getDefaultSharedPreferences(this);
        pref.registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onDetachedFromWindow() {
        pref.unregisterOnSharedPreferenceChangeListener(this);
        super.onDetachedFromWindow();
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        // TODO handle any special logic on change of a preference if you want
    }
}

SettingsFragment

public class SettingsFragment extends PreferenceFragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
    }
}

MainActivity，省略了其余的方法。

public class MainActivity extends Activity implements OnClickListener {

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        ...
}

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

    ActionBar bar = getActionBar();
    bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor(BAR_COLOUR)));
    context = getApplicationContext();

    View createButton = findViewById(R.id.locate_button);
    createButton.setOnClickListener(this);
    latitudeTextView = (TextView) findViewById(R.id.latitude_textview);
    latitudeTextView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.define_location, 0, 0, 0);
    latitudeValueTextView = (TextView) findViewById(R.id.latitude_value_textview);
    longitudeTextView = (TextView) findViewById(R.id.longitude_textview);
    longitudeTextView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.define_location, 0, 0, 0);
    longitudeValueTextView = (TextView) findViewById(R.id.longitude_value_textview);
    accuracyTextView = (TextView) findViewById(R.id.accuracy_textview);
    accuracyTextView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.info, 0, 0, 0);
    accuracyValueTextView = (TextView) findViewById(R.id.accuracy_value_textview);
    lastUpdateTextView = (TextView) findViewById(R.id.last_update_view);
    lastUpdateValueTextView = (TextView) findViewById(R.id.last_update_date);

    webView = (WebView) findViewById(R.id.map_view);
    webView.setWebViewClient(new WebViewClient());
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setVisibility(View.INVISIBLE);

    isPermissionGiven();

}

的preferences.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory
        android:title="@string/pref_catOne"
        android:key="pref_key_catOne" >
        <CheckBoxPreference
            android:key="mockCheckBox"
            android:defaultValue="true"
            android:title="@string/pref_mockCheckBoxOne"
            android:summary="@string/pref_mockCheckBoxSummary" />
        <CheckBoxPreference
            android:key="mockCheckBox"
            android:defaultValue="true"
            android:title="@string/pref_mockCheckBoxTwo"
            android:summary="@string/pref_mockCheckBoxSummary" />
    </PreferenceCategory>
    <PreferenceCategory
        android:title="@string/pref_catTwo"
        android:key="pref_key_catTwo" >
    </PreferenceCategory>
</PreferenceScreen>

activity_settings.xml

<fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    class="org.softshack.SettingsFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

main_activity.xml（仅限按钮）

<Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/accuracy_textview"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:id="@+id/settingsButton" />

Answer 1

的设置活动应该来自 PreferenceActivity ，而不是活动：

template <typename R, typename... Args>
class C<R(*)(Args...)> {
    using func_ptr = R(*)(Args...);
    public: bool isLess(func_ptr l, func_ptr r) { return std::less<>{}(l, r); }
};

Answer 2

以下是设置页面所需的所有部件的完整示例。

为活动activity_settings.xml创建布局：

<fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    class="com.yourorg.yourapp.package.to.SettingsFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

更新class attr以反映SettingsFragment的路径。只需删除它并开始输入，它应该在android studio中自动完成。

创建设置活动SettingsActivity.java：

public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {

    private SharedPreferences pref;

    public static void start(Context context) {
        Intent intent = new Intent(context, SettingsActivity.class);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_settings);
        pref = PreferenceManager.getDefaultSharedPreferences(this);
        pref.registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onDetachedFromWindow() {
        pref.unregisterOnSharedPreferenceChangeListener(this);
        super.onDetachedFromWindow();
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        // TODO handle any special logic on change of a preference if you want
    }
}

创建SettingsFragment.java：

public class SettingsFragment extends PreferenceFragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
    }
}

Answer 3

我不是你的点击模式的粉丝，但如果你想保持它只是使用：

View settingsButton = findViewById(R.id. settingsButton);
settingsButton.setOnClickListener(this);

将设置页面添加到应用程序

3 个答案: