Settings-display

显示设置：

一：直接定位到onCreate()

<pre name="code" class="java">@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        ContentResolver resolver = getActivity().getContentResolver();//还是获取contentresover对象        addPreferencesFromResource(R.xml.display_settings);//加载数据--------------------------------------------------------------------------------------------------------------        mAccelerometer = (CheckBoxPreference) findPreference(KEY_ACCELEROMETER);        mAccelerometer.setPersistent(false);

------------------------------------------------------------------------------------------------------------1：实例化一个checkBox        if (!RotationPolicy.isRotationSupported(getActivity())                || RotationPolicy.isRotationLockToggleSupported(getActivity())) {            // If rotation lock is supported, then we do not provide this option in            // Display settings.  However, is still available in Accessibility settings,            // if the device supports rotation.            getPreferenceScreen().removePreference(mAccelerometer);        }------------------------------------------------------------------------------------------------------------如果支持旋转锁不提供这个选项        mScreenSaverPreference = findPreference(KEY_SCREEN_SAVER);        if (mScreenSaverPreference != null                && getResources().getBoolean(                        com.android.internal.R.bool.config_dreamsSupported) == false) {            getPreferenceScreen().removePreference(mScreenSaverPreference);        }-------------------------------------------------------------------------------------------------------------2：实例化一个fragment，满足条件就移除        mScreenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);        long currentTimeout = Settings.System.getLong(resolver, SCREEN_OFF_TIMEOUT,//从数据库取值                FALLBACK_SCREEN_TIMEOUT_VALUE);        long timeoutValue = (currentTimeout == Integer.MAX_VALUE) ? -1 : currentTimeout;        mScreenTimeoutPreference.setValue(String.valueOf(timeoutValue));        mScreenTimeoutPreference.setOnPreferenceChangeListener(this);        disableUnusableTimeouts(mScreenTimeoutPreference);        updateTimeoutPreferenceDescription(timeoutValue);------------------------------------------------------------------------------------------------------------3：实例化一个listPreference        mFontSizePref = (WarnedListPreference) findPreference(KEY_FONT_SIZE);<span style="white-space:pre"></span>mFontSizePref.setOnPreferenceChangeListener(this);        mFontSizePref.setOnPreferenceClickListener(this);

------------------------------------------------------------------------------------------------------------4：实例化设置字体大小的        mNotificationPulse = (CheckBoxPreference) findPreference(KEY_NOTIFICATION_PULSE);        if (mNotificationPulse != null                && getResources().getBoolean(                        com.android.internal.R.bool.config_intrusiveNotificationLed) == false) {            getPreferenceScreen().removePreference(mNotificationPulse);        } else {            try {                mNotificationPulse.setChecked(Settings.System.getInt(resolver,                        Settings.System.NOTIFICATION_LIGHT_PULSE) == 1);                mNotificationPulse.setOnPreferenceChangeListener(this);            } catch (SettingNotFoundException snfe) {                Log.e(TAG, Settings.System.NOTIFICATION_LIGHT_PULSE + " not found");            }        }------------------------------------------------------------------------------------------------------------5：实例化checkBox        mCablBrightnessPreference = (CheckBoxPreference) findPreference(KEY_CABL_BRIGHTNESS);        mCABLServiceWrapper = new CABLServiceWrapper(this.getActivity());        if (!mCABLServiceWrapper.isCABLAvailable()) {             getPreferenceScreen().removePreference(mCablBrightnessPreference);        } else {            mCABLServiceWrapper.initCABLService();        }

------------------------------------------------------------------------------------------------------------6：实例化checkBox

</pre>二：来看一下XML文件中的布局Display_settings<pre name="code" class="java"><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"        android:title="@string/display_settings"        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings">-------------------------------------------        <com.android.settings.BrightnessPreference                android:title="@string/brightness"                android:persistent="false"/>-------------------------------------------------------//上面是自己定义的两度类        <CheckBoxPreference                android:key="cabl_brightness"                android:title="@string/enhanced_brightness"                android:summary="@string/enhanced_brightness_summary"/>---------------------------------------------------------------//cabl亮度        <PreferenceScreen            android:persistent="false"            android:key="screencolor_settings"            android:title="@string/screencolor">            <intent                android:action="android.intent.action.MAIN"                android:targetPackage="com.android.settings"                android:targetClass="com.android.settings.ScreenColorSettings" />        </PreferenceScreen>--------------------------------------------------------------------------------------------屏幕颜色设置        <PreferenceScreen                android:key="wallpaper"                android:title="@string/wallpaper_settings_title"                android:fragment="com.android.settings.WallpaperTypeSettings" />-------------------------------------------------------------------------------------------壁纸的设置fragment        <CheckBoxPreference            android:key="accelerometer"            android:title="@string/accelerometer_title"/>---------------------------------------------------------------------------旋转屏幕的checkBox        <ListPreference                android:key="screen_timeout"                android:title="@string/screen_timeout"                android:summary="@string/screen_timeout_summary"                android:persistent="false"                android:entries="@array/screen_timeout_entries"                android:entryValues="@array/screen_timeout_values" />-----------------------------------------------------------------------------list类型的休眠        <PreferenceScreen                android:key="screensaver"                android:title="@string/screensaver_settings_title"                android:fragment="com.android.settings.DreamSettings" />----------------------------------------------------------------------------fragment互动屏保        <com.android.settings.WarnedListPreference                android:key="font_size"                android:title="@string/title_font_size"                android:summary="@string/summary_font_size"                android:entries="@array/entries_font_size"                android:entryValues="@array/entryvalues_font_size"                android:dialogTitle="@string/dialog_title_font_size" />----------------------------------------------------------------------------字体大小的设置        <CheckBoxPreference            android:key="notification_pulse"            android:title="@string/notification_pulse_title"            android:persistent="false" />------------------------------------------------------------收到通知指示灯闪烁

<span style="white-space:pre"><PreferenceScreen                android:key="wifi_display"                android:title="@string/wifi_display_settings_title"                android:fragment="com.android.settings.wfd.WifiDisplaySettings" /></span>投射屏幕</PreferenceScreen>

三：定位到onCreateView()

@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View v = inflater.inflate(R.layout.add_layout_preference,null);return v;}

四：定位onResume()

@Override    public void onResume() {        super.onResume();        RotationPolicy.registerRotationPolicyListener(getActivity(),                mRotationPolicyListener);<span style="color:#505050;">主要更新了当前的配置项目，自动旋转屏幕，字体大小，互动屏保</span>        updateState();    }

五：再看看单机事件onPreferenceTreeClick，当onPreferenceClick返回的是flase则调用这个方法

@Override    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {        if (preference == mAccelerometer) {            RotationPolicy.setRotationLockForAccessibility(                    getActivity(), !mAccelerometer.isChecked());        } else if (preference == mNotificationPulse) {            boolean value = mNotificationPulse.isChecked();            Settings.System.putInt(getContentResolver(), Settings.System.NOTIFICATION_LIGHT_PULSE,//指示灯选择                    value ? 1 : 0);            return true;        } else if (preference == mCablBrightnessPreference) {            final boolean checked = mCablBrightnessPreference.isChecked();//cal亮度            if (checked) {                mCABLServiceWrapper.startCABL();            } else {                mCABLServiceWrapper.stopCABL();            }        }        return super.onPreferenceTreeClick(preferenceScreen, preference);//调用父类的方法，启动fragment，或者是启动activity    }

看看onPreferenceClick，先走onPreferenceClick，再走onPreferenceTreeClick，当下面的返回为true就不走上面的了，因为字体的先设置

@Override    public boolean onPreferenceClick(Preference preference) {        if (preference == mFontSizePref) {            if (Utils.hasMultipleUsers(getActivity())) {                showDialog(DLG_GLOBAL_CHANGE_WARNING);//主要是设置字体                return true;            } else {                mFontSizePref.click();            }        }        return false;    }<pre name="code" class="java">protected void showDialog(int dialogId) {        if (mDialogFragment != null) {            Log.e(TAG, "Old dialog fragment not null!");        }        mDialogFragment = new SettingsDialogFragment(this, dialogId);        mDialogFragment.show(getActivity().getFragmentManager(), Integer.toString(dialogId));    }

</pre><p></p><pre>

六：就都分析完了，大概的这个界面的流程，再看里面的每个界面的分析

一：亮度BrightnessPreference这个类

public class BrightnessPreference extends Preference {    public BrightnessPreference(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onClick() {        Intent intent = new Intent(Intent.ACTION_SHOW_BRIGHTNESS_DIALOG);        getContext().sendBroadcastAsUser(intent, UserHandle.CURRENT_OR_SELF);发送一个广播显示亮度调节    }}

二：壁纸WallpaperTypeSettings这个类

public class WallpaperTypeSettings extends SettingsPreferenceFragment {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.wallpaper_settings);        populateWallpaperTypes();    }    private void populateWallpaperTypes() {        // Search for activities that satisfy the ACTION_SET_WALLPAPER action        Intent intent = new Intent(Intent.ACTION_SET_WALLPAPER);        final PackageManager pm = getPackageManager();        List<ResolveInfo> rList = pm.queryIntentActivities(intent,                PackageManager.MATCH_DEFAULT_ONLY);        final PreferenceScreen parent = getPreferenceScreen();        parent.setOrderingAsAdded(false);        // Add Preference items for each of the matching activities下面就是给每个条目加动态添加，原来自数据库查询出来的        for (ResolveInfo info : rList) {            Preference pref = new Preference(getActivity());            Intent prefIntent = new Intent(intent);            prefIntent.setComponent(new ComponentName(                    info.activityInfo.packageName, info.activityInfo.name));            pref.setIntent(prefIntent);            CharSequence label = info.loadLabel(pm);            if (label == null) label = info.activityInfo.packageName;            pref.setTitle(label);            parent.addPreference(pref);        }    }}

三：休眠是个listpreference

四：字体大小显示dialog