System UI Tuner分析

2019-11-06 09:42:18

字體：大中小

來源：轉載

供稿：網友

前言:PRactice make perfect. 堅持一些東西，并沒有很難。

界面展示

系統界面調制器是安卓M加入的，當用戶長按下拉菜單的齒輪卡3秒中就可以在setting app里加入界面調制器。操作過程：下拉菜單，顯示QSPanel 這里寫圖片描述長按設置按鈕，會發現增加了一個條目

代碼走向

相關的代碼流動過程如下，com.android.systemui.statusbar.phone.QuickStatusBarHeader.javapublic class QuickStatusBarHeader extends BaseStatusBarHeader implements NextAlarmChangeCallback, OnClickListener, OnUserInfoChangedListener { ...... private SettingsButton mSettingsButton; public QuickStatusBarHeader(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onFinishInflate() { ...... mSettingsButton = (SettingsButton) findViewById(R.id.settings_button); mSettingsButton.setOnClickListener(this); ...... } @Override public void onClick(View v) { if (v == mSettingsButton) {if (mSettingsButton.isTunerClick() && !isRestrictedByPolicy && !Utils.isUsmEnabled(mContext)) { if (TunerService.isTunerEnabled(mContext)) { TunerService.showResetRequest(mContext, () -> { // Relaunch settings so that the tuner disappears. startSettingsActivity(); }); } else { Toast.makeText(getContext(), R.string.tuner_toast, Toast.LENGTH_LONG).show(); TunerService.setTunerEnabled(mContext, true); } startSettingsActivity(); ...... } } }}

上面的code，當用戶退出tuner模式，會調用TunerService.showResetRequest，進行一些數據的重置。這個方法后面分析。然后再重啟setting app。

public class SettingsButton extends AlphaOptimizedImageButton { ...... public boolean onTouchEvent(MotionEvent event) { switch (event.getActionMasked()) { case MotionEvent.ACTION_DOWN: postDelayed(mLongPressCallback, LONG_PRESS_LENGTH); break; case MotionEvent.ACTION_UP: if (mUpToSpeed) { startExitAnimation(); } else { cancelLongClick(); } break; case MotionEvent.ACTION_CANCEL: cancelLongClick(); break; case MotionEvent.ACTION_MOVE: float x = event.getX(); float y = event.getY(); if ((x < -mSlop) || (y < -mSlop) || (x > getWidth() + mSlop) || (y > getHeight() + mSlop)) { cancelLongClick(); } break; } return super.onTouchEvent(event); } ......}

settingButton的onTouchEvent方法，設定了事件處理，以及相關的動畫，長按時，會調用

TunerService.setTunerEnabled(mContext, true);

然后start setting app。

TunerService.java

public class TunerService extends SystemUI { ...... public static final void setTunerEnabled(Context context, boolean enabled) { userContext(context).getPackageManager().setComponentEnabledSetting( new ComponentName(context, TunerActivity.class), enabled ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED : PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP); }......}

api解釋： public void setComponentEnabledSetting (ComponentName componentName, int newState, int flags) componentName：組件名稱 newState：組件新的狀態，可以設置三個值，分別是如下：不可用狀態：COMPONENT_ENABLED_STATE_DISABLED 可用狀態：COMPONENT_ENABLED_STATE_ENABLED 默認狀態：COMPONENT_ENABLED_STATE_DEFAULT flags:行為標簽，值可以是DONT_KILL_APP或者0。 0說明殺死包含該組件的app 。

這里的意思就是說啟動TunerActivity。

public class TunerActivity extends SettingsDrawerActivity{...... protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getFragmentManager().findFragmentByTag(TAG_TUNER) == null) { final String action = getIntent().getAction(); boolean showDemoMode = action != null && action.equals( "com.android.settings.action.DEMO_MODE"); boolean showNightMode = getIntent().getBooleanExtra( NightModeFragment.EXTRA_SHOW_NIGHT_MODE, false); final PreferenceFragment fragment = showNightMode ? new NightModeFragment() : showDemoMode ? new DemoModeFragment() : new TunerFragment(); getFragmentManager().beginTransaction().replace(R.id.content_frame, fragment, TAG_TUNER).commit(); } setIsDrawerPresent(false); }......}

Activity會根據Intent傳遞過來的參數承載一個fragment，在這里我們關心 TunerFragment。

public class TunerFragment extends PreferenceFragment {...... @Override// public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); } @Override//對ActionBar進行設置 public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getActivity().getActionBar().setDisplayHomeAsUpEnabled(true); } @Override//給preference添加了很多的子項。 public void onCreatePreferences(Bundle savedInstanceState, String rootKey) { addPreferencesFromResource(R.xml.tuner_prefs); if (Settings.Secure.getInt(getContext().getContentResolver(), SETTING_SEEN_TUNER_WARNING, 0) == 0) { if (getFragmentManager().findFragmentByTag(WARNING_TAG) == null) { new TunerWarningFragment().show(getFragmentManager(), WARNING_TAG); } }}

這是有ActionBar的fragment 這里寫圖片描述

這是提到的addPreferencesFromResource(R.xml.tuner_prefs)，是這個頁面這里寫圖片描述

文件管理

在顯示界面的后面，會有一套數據，用來傳遞設置的內容。 android5.1后沒有settingprovider來保存setting app的數據了。而是會感覺多用戶機制建立一些xml檔，來保存用戶信息

adb rootpause adb remountpauseadb pull /data/system/users/0/ D:/protable/pull_phoneDate/myfolder2pause

把用戶id為0的信息pull到pc上這里寫圖片描述。

前面提到的 TunerService.showResetRequest方法會通過發送廣播重置文件的一些信息

public static final void showResetRequest(final Context context, final Runnable onDisabled) { SystemUIDialog dialog = new SystemUIDialog(context); dialog.setShowForAllUsers(true); dialog.setMessage(R.string.remove_from_settings_prompt); dialog.setButton(DialogInterface.BUTTON_NEGATIVE, context.getString(R.string.cancel), (OnClickListener) null); dialog.setButton(DialogInterface.BUTTON_POSITIVE, context.getString(R.string.guest_exit_guest_dialog_remove), new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // Tell the tuner (in main SysUI process) to clear all its settings.廣播發送者 context.sendBroadcast(new Intent(TunerService.ACTION_CLEAR)); // Disable access to tuner. TunerService.setTunerEnabled(context, false); // Make them sit through the warning dialog again. Settings.Secure.putInt(context.getContentResolver(), TunerFragment.SETTING_SEEN_TUNER_WARNING, 0); if (onDisabled != null) { onDisabled.run(); } } }); dialog.show(); }//廣播接受者public static class ClearReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (ACTION_CLEAR.equals(intent.getAction())) { get(context).clearAll(); } } } //db操作 public void clearAll() { // A couple special cases. Settings.Global.putString(mContentResolver, DemoMode.DEMO_MODE_ALLOWED, null); Settings.System.putString(mContentResolver, BatteryMeterDrawable.SHOW_PERCENT_SETTING, null); Intent intent = new Intent(DemoMode.ACTION_DEMO); intent.putExtra(DemoMode.EXTRA_COMMAND, DemoMode.COMMAND_EXIT); mContext.sendBroadcast(intent); for (String key : mTunableLookup.keySet()) { Settings.Secure.putString(mContentResolver, key, null); } }

這里用了一個廣播，就可以方便別的應用來重置user的參數信息了