android 开机向导OOBE源码分析

OOBE是开机向导，普通的理解就是一个界面跳另一个界面再跳下一个界面，OOBE却不是这么实现的。下面分析OOBE界面跳转实现：

打开OOBE目录，找到入口是WizardActivity.java,该Activity随后跳转到MainActivity.java。OOBE界面跳转逻辑都在MainActivity.java里实现。

对于一个陌生的Activity，我们先看它的onCreate方法：

@Override    public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState); Log.i("xsslog","OOBE MainActivity onCreate() ----------111"); this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);//forbid homeKey        mSimExist = isSimExist();        Xlog.d(TAG, "onCreate mSimExist = " + mSimExist);        if (savedInstanceState != null) {            mCurrentStep = savedInstanceState.getInt("currentStep");            mTotalStep = savedInstanceState.getInt("totalSteps");            Log.i("xsslog", "restore saved instance state mCurrentStep=" + mCurrentStep + "mTotalStep="                    + mTotalStep);            setActivityList();        }                //Diable window rotate for phone.          setWindowRotation(false);        //disable quick start guide for tablet        //disableQSG();                mIsFirstRun = Settings.System.getInt(getContentResolver(), Utils.OOBE_HAS_RUN_KEY, 0) == 0; Log.i("xsslog","OOBE MainActivity onCreate() -----222-----mIsFirstRun="+mIsFirstRun);        if (mIsFirstRun) {            Settings.System.putInt(getContentResolver(),                Settings.System.OOBE_DISPLAY, Settings.System.OOBE_DISPLAY_ON);            Settings.Global.putInt(getContentResolver(), Settings.Global.DEVICE_PROVISIONED, 0);            enableStatusBar(false);        }        mBootMode = getBootMode();              if (mIsFirstRun && mBootMode != BOOT_MODE_ADV_META && !Utils.isWifiOnly(this)) {             mHandler.sendEmptyMessageDelayed(EVENT_MONITOR_SIM_TIME_OUT, TIME_MONITOR_SIM);      Log.i("xsslog","OOBE MainActivity ()=========");             //showDialog(DIALOG_WAITING_SIM);        } else {            mHandler.sendEmptyMessage(EVENT_SIM_DETECTING_READY);        }                        mSIMIntentFilter = new IntentFilter(TelephonyIntents.ACTION_SIM_INFO_UPDATE);        registerReceiver(mSIMStateReceiver, mSIMIntentFilter);  pm = getPackageManager();        name = new ComponentName(this, WizardActivity.class);if(pm != null)//added by lzp        state = pm.getComponentEnabledSetting(name);/*  mVelocityTracker = VelocityTracker.obtain();        mScreenOffReceiverFilter = new IntentFilter(); mScreenOffReceiverFilter.addAction(Intent.ACTION_SCREEN_ON); registerReceiver(mScreenOffReceiver,mScreenOffReceiverFilter); */          }

其中mCurrentStep是指当前界面数，mTotalStep是指OOBE总界面数。mIsFirstRun判断是否第一次进入OOBE，做相应处理

这里的重点是看setActivityList();

protected void setActivityList() { boolean mIphoneFlag = Settings.System.getInt(this.getContentResolver(), Settings.System.ISIPHONE, 0) == 1;//added by lzp boolean noIphoneChars = "1".equals(SystemProperties.get("ro.cenon_setting_no_iPhone"));//added by lzp boolean switchPagesByLogo = "1".equals(SystemProperties.get("cenon.switch_oobe_pages_by_logo"));//added by lzp Xlog.d(TAG, "setActivityList() mIphoneFlag="+mIphoneFlag);     mStepActivityies.clear(); if((!switchPagesByLogo && !noIphoneChars) || mIphoneFlag) { mStepActivityies.add(mLanguageSettings); mStepActivityies.add(mCountrySettings); mStepActivityies.add(iMessageAndFaceTime);// add by csc for ios 10 mStepActivityies.add(mInputMethodSettings); mStepActivityies.add(mWifiSettings); mStepActivityies.add(mfinishOobe); } else {//added by lzp  mStepActivityies.add(mLanguageSettings); mStepActivityies.add(mCountrySettings); mStepActivityies.add(mInputMethodSettings); mStepActivityies.add(mfinishOobe); }     mTotalStep = mStepActivityies.size();    }

可以看到每个界面都被加到了mStepActivityies里面，mTotalStep就是在这里得出

private List<OobeActivityInfo> mStepActivityies = new ArrayList<OobeActivityInfo>();

我们发现里面有个mHandler处理，于是我们跳到该mHandler：

private Handler mHandler = new Handler() {        @Override        public void handleMessage(android.os.Message msg) {            switch (msg.what) {            case EVENT_MONITOR_SIM_TIME_OUT:                Xlog.v(TAG, "handler wait SIM time out");                break;            case EVENT_SIM_DETECTING_READY:                Xlog.v(TAG, "handler SIM initialization finish");                mHandler.removeMessages(EVENT_MONITOR_SIM_TIME_OUT);                break;     case EVENT_PREPAREING_END_OOBE:   mHandler.removeMessages(EVENT_PREPAREING_END_OOBE);   finish();                break;     default:                break;            }            initStep();            //removeDialog(DIALOG_WAITING_SIM);        };    };

可以看到有EVENT_MONITOR_SIM_TIME_OUT，EVENT_SIM_DETECTING_READY，EVENT_PREPAREING_END_OOBE等情况的处理，我们主要研究OOBE界面是如何进行跳转的，上面的就不细做分析了。然后就注意到initStep()方法

private void initStep() {               if (mIsStepInitiated) {            return;        }        mIsStepInitiated = true;        setActivityList();        if (mCurrentStep == -1) {            nextActivity(true);        }    }

setActivityList()上面说了把界面都放入list，重点看nextActivity方法

protected void nextActivity(boolean nextStep) {             if (nextStep) {if(mCurrentStep<0) { mCurrentStep++; Intent lockScreenIntent = new Intent(ACTION_LOCK_SCREEN); startActivityForResult(lockScreenIntent, REQUEST_CODE_ADVANCED_SETTINGS); return; }            else mCurrentStep++;        } else {            mCurrentStep--;        }             if (mCurrentStep >= 0 && mCurrentStep < mStepActivityies.size()) {            Intent intent = mStepActivityies.get(mCurrentStep).getIntent();            intent.putExtra(Utils.OOBE_BASIC_STEP_TOTAL, mTotalStep);            intent.putExtra(Utils.OOBE_BASIC_STEP_INDEX, mCurrentStep + 1);            intent.putExtra(EXTRA_IS_OOBE, true);            startActivityForResult(intent, mCurrentStep);            if (nextStep) {   overridePendingTransition(R.anim.slide_right_in, R.anim.slide_left_out);                //overridePendingTransition(R.anim.zoomin, R.anim.zoomout);            } else {                 overridePendingTransition(R.anim.slide_left_in, R.anim.slide_right_out);                 //overridePendingTransition(R.anim.zoomin, R.anim.zoomout);            }        }    }

nextStep用来判断下一步还是上一步，mCurrentStep是要跳转界面的值，知道这个前一部分代码就好理解了

Intent intent = mStepActivityies.get(mCurrentStep).getIntent();            intent.putExtra(Utils.OOBE_BASIC_STEP_TOTAL, mTotalStep);            intent.putExtra(Utils.OOBE_BASIC_STEP_INDEX, mCurrentStep + 1);            intent.putExtra(EXTRA_IS_OOBE, true);            startActivityForResult(intent, mCurrentStep);

根据mCurrentStep从mStepActivityies取出该界面的包名，用startActivityForResult方法进行跳转，我们可以看下回传的参数用来干嘛

其他界面点击上一步或者下一步的时候就调用finishActivityByResult(Utils.RESULT_CODE_TO_NO_STEP);

@Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.back_settings_btn:                finishActivityByResult(Utils.RESULT_CODE_TO_NO_STEP);                break;            case R.id.next_settings_btn:              /*  Intent intent = new Intent();                intent.setClass(OobeLoginiCloudActivity.this,OobeTermsAndConditionsActivity.class);                intent.putExtra("GOTO_BY_ICLOUD",true);                startActivity(intent);                finish();*/                finishActivityByResult(Utils.RESULT_CODE_TO_TWO_STEP);                break;        }    }

 private void finishActivityByResult(int resultCode) {        Intent intent = new Intent();        setResult(resultCode, intent);        finish();    }

然后把这个是跳上一步还是下一步传回MainActivity，由MainActivity进行统一跳转，而不是从当前界面直接往下跳。

@Override    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {        Xlog.d(TAG, "onActivityResult resultCode = " + resultCode);        switch (resultCode) {            case Utils.RESULT_CODE_BACK:                if (0 == mCurrentStep) {                    finish();                } else {                    nextActivity(false);                }                break;            case Utils.RESULT_CODE_NEXT:                nextActivity(true);                break;            case Utils.RESULT_CODE_FINISH:                finishOOBE();                break;            case Utils.RESULT_CODE_TO_ONE_STEP:// add by csc for ios 10                mCurrentStep++;                nextActivity(true);                break;            case Utils.RESULT_CODE_TO_TWO_STEP:// add by csc for ios 10                mCurrentStep=mCurrentStep+2;                nextActivity(true);                break;            case Utils.RESULT_CODE_TO_LOGIN_ICLOUD:// add by csc for ios 10                intent = new Intent();                intent.setClass(MainActivity.this,OobeLoginiCloudActivity.class);                startActivityForResult(intent, 1001);                break;            case Utils.RESULT_CODE_TO_FORGET_PASSWORD:                intent = new Intent();                intent.setClass(MainActivity.this,OobeForgetPasswordActivity.class);                startActivityForResult(intent, 1001);                break;            case Utils.RESULT_CODE_TO_CREATE_APPLE_ID:// add by csc for ios 10                intent = new Intent();                intent.setClass(MainActivity.this,OobeCreateAppleIdActivity.class);                startActivityForResult(intent, 1001);                break;            case Utils.RESULT_CODE_TO_FORGET_APPLE_ID:// add by csc for ios 10                intent = new Intent();                intent.setClass(MainActivity.this,OobeForgetAppleIDActivity.class);                startActivityForResult(intent, 1001);                break;            case Utils.RESULT_CODE_TO_NO_STEP:// add by csc for ios 10                mCurrentStep--;                nextActivity(true);                break;     case 100:              { /**Begin: added by lzp **/if(mCurrentStep < 0) {mHandler.sendEmptyMessage(EVENT_SIM_DETECTING_READY);return; } /**End: added by lzp **/                 Intent backIntent = mStepActivityies.get(mCurrentStep).getIntent();                 backIntent.putExtra(Utils.OOBE_BASIC_STEP_TOTAL, mTotalStep);                 backIntent.putExtra(Utils.OOBE_BASIC_STEP_INDEX, mCurrentStep + 1);                 backIntent.putExtra(EXTRA_IS_OOBE, true);                 startActivityForResult(backIntent, mCurrentStep);    overridePendingTransition(R.anim.slide_left_in, R.anim.slide_right_out);    //overridePendingTransition(R.anim.zoomin, R.anim.zoomout); }                break;            case Utils.RESULT_SCREEN_OFF:                {Intent lockScreenIntent = new Intent(ACTION_LOCK_SCREEN);        startActivityForResult(lockScreenIntent, REQUEST_CODE_ADVANCED_SETTINGS); overridePendingTransition(R.anim.slide_left_in, R.anim.slide_right_out);         //overridePendingTransition(R.anim.zoomin, R.anim.zoomout);}                break;            default:                break;        }    }

到这里就完成了OOBE的界面跳转。