class ToolContentProvider : ContentProvider() {

    override fun onCreate(): Boolean {
        Log.e(GlobalConfig.LOG_TAG, "ToolContentProvider onCreate")
        AppContextHelper.init(context!!.applicationContext)
        AppContextHelper.initRoomDB(context!!.applicationContext)
        return true
    }

    override fun query(uri: Uri, projection: Array<out String>?, selection: String?, selectionArgs: Array<out String>?, sortOrder: String?): Cursor? {
        return null
    }

    override fun getType(uri: Uri): String? {
        return null
    }

    override fun insert(uri: Uri, values: ContentValues?): Uri? {
        return null
    }

    override fun delete(uri: Uri, selection: String?, selectionArgs: Array<out String>?): Int {
        return 0
    }

    override fun update(uri: Uri, values: ContentValues?, selection: String?, selectionArgs: Array<out String>?): Int {
        return 0
    }
}

<provider
      android:name=".ToolContentProvider"
      android:authorities="${applicationId}.library-tool"
      android:exported="false" />

class MaoApplication : Application() {

    private lateinit var currentActivityRef: WeakReference<Activity>;


    override fun attachBaseContext(base: Context?) {
        super.attachBaseContext(base)
        Log.e(GlobalConfig.LOG_TAG, "MaoApplication attachBaseContext")
    }

    override fun onCreate() {
        super.onCreate()
        Log.e(GlobalConfig.LOG_TAG, "MaoApplication onCreate")
        initMMKV()
        initCodeView()
	}

    /**
     * 初始化MMKV工具
     */
    private fun initMMKV() {
        Log.e(GlobalConfig.LOG_TAG, "init MMKV")
        MMKV.initialize(this);
    }

    private fun initCodeView() {
        CodeProcessor.init(this)
    }

}

com.renhui.maomaomedia E/MaoMaoMedia: MaoApplication attachBaseContext
com.renhui.maomaomedia E/MaoMaoMedia: ToolContentProvider onCreate
com.renhui.maomaomedia E/MaoMaoMedia: MaoApplication onCreate

 private void handleBindApplication(AppBindData data) {
     ....
     final InstrumentationInfo ii;
     ....
     if (ii != null) {
       //1.創(chuàng)建ContentImpl
       final ContextImpl instrContext = ContextImpl.createAppContext(this, pi);
            try {
                final ClassLoader cl = instrContext.getClassLoader();
                mInstrumentation = (Instrumentation)
                    cl.loadClass(data.instrumentationName.getClassName()).newInstance();
            } catch (Exception e) {
                throw new RuntimeException(
                    "Unable to instantiate instrumentation "
                    + data.instrumentationName + ": " + e.toString(), e);
            }

        //2.創(chuàng)建Instrumentation
      final ComponentName component = new ComponentName(ii.packageName, ii.name);
            mInstrumentation.init(this, instrContext, appContext, component,
                    data.instrumentationWatcher, data.instrumentationUiAutomationConnection);
        ....
        //3.創(chuàng)建Application對象
         Application app;
         app = data.info.makeApplication(data.restrictedBackupMode, null);

         // Propagate autofill compat state
            app.setAutofillCompatibilityEnabled(data.autofillCompatibilityEnabled);

            mInitialApplication = app;

        ...
        //4.啟動當(dāng)前進(jìn)程中的ContentProvider和調(diào)用其onCreate方法

        if (!data.restrictedBackupMode) {
                if (!ArrayUtils.isEmpty(data.providers)) {
                    installContentProviders(app, data.providers);
                    // For process that contains content providers, we want to
                    // ensure that the JIT is enabled "at some point".
                    mH.sendEmptyMessageDelayed(H.ENABLE_JIT, 10*1000);
                }
            }

        //5.調(diào)用Application的onCreate方法
        try {
                mInstrumentation.callApplicationOnCreate(app);
            } catch (Exception e) {
                if (!mInstrumentation.onException(app, e)) {
                    throw new RuntimeException(
                      "Unable to create application " + app.getClass().getName()
                      + ": " + e.toString(), e);
                }
            }
    }
 }

private void attachInfo(Context context, ProviderInfo info, boolean testing) {
    mNoPerms = testing;

    /*
     * Only allow it to be set once, so after the content service gives
     * this to us clients can't change it.
     */
    if (mContext == null) {
        mContext = context;
        if (context != null) {
            mTransport.mAppOpsManager = (AppOpsManager) context.getSystemService (Context.APP_OPS_SERVICE);
        }
        mMyUid = Process.myUid();
        if (info != null) {
            setReadPermission(info.readPermission);
            setWritePermission(info.writePermission);
            setPathPermissions(info.pathPermissions);
            mExported = info.exported;
            mSingleUser = (info.flags & ProviderInfo.FLAG_SINGLE_USER) != 0;
            setAuthorities(info.authority);
        }
        ContentProvider.this.onCreate();
    }
}