System UI Tuner分析

2019-11-06 09:42:18

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来源：转载

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前言:PRactice make perfect. 坚持一些东西，并没有很难。

界面展示

系统界面调制器是安卓M加入的，当用户长按下拉菜单的齿轮卡3秒中就可以在setting app里加入界面调制器。操作过程：下拉菜单，显示QSPanel 这里写图片描述长按设置按钮，会发现增加了一个条目

代码走向

相关的代码流动过程如下，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，当用户退出tuner模式，会调用TunerService.showResetRequest，进行一些数据的重置。这个方法后面分析。然后再重启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，设定了事件处理，以及相关的动画，长按时，会调用

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解释： public void setComponentEnabledSetting (ComponentName componentName, int newState, int flags) componentName：组件名称 newState：组件新的状态，可以设置三个值，分别是如下：不可用状态：COMPONENT_ENABLED_STATE_DISABLED 可用状态：COMPONENT_ENABLED_STATE_ENABLED 默认状态：COMPONENT_ENABLED_STATE_DEFAULT flags:行为标签，值可以是DONT_KILL_APP或者0。 0说明杀死包含该组件的app 。

这里的意思就是说启动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会根据Intent传递过来的参数承载一个fragment，在这里我们关心 TunerFragment。

public class TunerFragment extends PreferenceFragment {...... @Override// public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); } @Override//对ActionBar进行设置 public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getActivity().getActionBar().setDisplayHomeAsUpEnabled(true); } @Override//给preference添加了很多的子项。 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); } }}

这是有ActionBar的fragment 这里写图片描述

这是提到的addPreferencesFromResource(R.xml.tuner_prefs)，是这个页面这里写图片描述

文件管理

在显示界面的后面，会有一套数据，用来传递设置的内容。 android5.1后没有settingprovider来保存setting app的数据了。而是会感觉多用户机制建立一些xml档，来保存用户信息

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

把用户id为0的信息pull到pc上这里写图片描述。

前面提到的 TunerService.showResetRequest方法会通过发送广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.广播发送者 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(); }//广播接受者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); } }

这里用了一个广播，就可以方便别的应用来重置user的参数信息了